An Analysis of Lakers Replacements for Marcus Smart and Rui Hachimura
# An Analysis of Lakers Replacements for Marcus Smart and Rui Hachimura
### Stats taken from 2025-26 BBall-Index Advanced Stats
| Out | In | Nominal position |
|---|---|---|
| Marcus Smart | Quentin Grimes | Guard / off-ball wing |
| Rui Hachimura | Sandro Mamukelashvili | Power forward |
## The Central Questions
This post is organized around six questions:
**Point-of-attack defense —** In each pair, who is the better perimeter defender? Who is the better *on-ball, point-of-attack* stopper? Do the Lakers keep the ability to put their best perimeter defender on the opponent's primary threat?
**Hiding Luka and AR —** Luka Dončić and Austin Reaves are not great defenders and have to be schemed around. Does either outgoing player take an assignment burden the incoming player cannot replace?
**Spacing, and whose shooting is *real* —** Do these swaps improve the floor-spacing around Luka and Reaves? And critically: which players' shooting numbers are manufactured by elite teammates?
**Off-ball engine & rim pressure —** In an offense run by two high-usage creators, who moves, cuts, and attacks closeouts — and who just stands still?
**Net verdict per pair —** Dimension by dimension, is each move an upgrade, an neutral move, or a downgrade, and where?
# PAIR 1 — Marcus Smart → Quentin Grimes
## 1A. Perimeter Defense
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Perimeter Isolation Defense | **1.19 (92)** | 0.77 (86) | Smart |
| Ball Screen Navigation | 1.63 (95) | **1.88 (97)** | Grimes |
| Off-Ball Chaser Defense | 0.55 (78) | **1.21 (92)** | Grimes |
| Passing Lane Defense | **1.22 (92)** | 0.47 (20) | **Smart, large** |
| Steals / 75 | **1.80 (87)** | 1.04 (39) | **Smart, large** |
| Matchup-Adj. Def. Feet / Min | **4.70 (52)** | −7.38 (32) | Smart |
When evaluating the replacement of Smart with Grimes, the core question is how effectively the new addition can be at defending the PoA. Both grade as good perimeter defenders, but they earn it a little differently. Grimes is the superior off-ball defender — he navigates screens (97th) and chases shooters (92nd) more effectively. Smart is the superior on-ball, point-of-attack defender: higher isolation defense (92nd vs 86th), and a chasm in disruption — 1.22 passing-lane rate (92nd) and 1.80 steals/75 (87th) against Grimes' 0.47 (20th) and 1.04 (39th). Smart forces live-ball events; Grimes contains his man but generates almost nothing.
| Guarded Data (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Matchup Difficulty | **1.65 (95)** | 0.38 (80) | **Smart, large** |
| Guarded USG% | **21.97% (94)** | 20.69% (80) | Smart |
| Guarded Guards% | 46.68% (87) | 45.97% (86) | ~even |
| Guarded On-Ball % | **24.38% (94)** | 22.38% (83) | Smart |
Smart didn't just defend well — he defended the hardest assignments (95th-percentile difficulty against 94th-percentile-usage guards). That was a team-need role: with Luka a defensive sieve, the Lakers pointed Smart at the opponent's primary perimeter threat every night. Grimes checked lower-usage assignments in Philly (80th difficulty). Even granting that Grimes is a fine perimeter defender, no one left on the roster absorbs the top-end assignment the way Smart did. It has to be seen if Grimes can fill that role.
## 1B. Interior & Help Defense
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Rim Protection | **0.52 (86)** | −0.46 (22) | Smart |
| Rim Deterrence / 100 | **1.07 (98)** | −0.43 (16) | **Smart, huge** |
| Post Defense | **1.52 (95)** | 0.20 (69) | Smart |
| Blocks / 75 | 0.48 (48) | 0.45 (45) | ~even |
The true value for Smart over Grimes is that Smart was actually great for Interior Defense. Smart provides rim and post value no guard should — 98th-percentile rim deterrence and 95th-percentile post defense, a product of elite strength and BBIQ. Grimes offers none of this (16th deterrence), so this is the significant downside of replacing Marcus Smart with Quentin Grimes.
## 1C. Perimeter Shooting, Gravity, and Floor Spacing
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| 3PT% | 33.11% (43) | 33.42% (49) | ~even |
| Catch-&-Shoot 3PT% | 33.17% (43) | **40.00% (77)** | Grimes |
| Stable C&S 3PT% | 35.34% (10) | **38.27% (88)** | **Grimes, huge** |
| 3PT Shooting Talent | −0.93 (19) | −0.44 (44) | Grimes |
| 3PT Versatility | 28.88 (38) | **49.53 (81)** | Grimes |
| Off-Ball Gravity | 0.11 (26) | **1.26 (77)** | **Grimes, large** |
| 3PT Attempt Rate | 61.55% (83) | 50.33% (64) | Smart (volume) |
Nearly identical raw 3PT%, wildly different value. **Grimes is a decisively better floor-spacer:** 40% catch-and-shoot on 88th-percentile *stability*, real off-ball gravity (77th vs Smart's 26th), and 81st-percentile shot versatility. Smart launches more threes (83rd attempt rate) on 19th-percentile talent — high volume, low quality, and defenses don't respect him off the ball.
That means when Doncic or Reaves drove the basketball, defenses felt comfortable sagging off Smart to crowd the paint, because they weren't afraid of him nailing a 3 when open. And he was open A LOT.
| Metric (value, pctile) | Smart | Grimes | Read |
|---|---|---|---|
| | | | |
| 3PT Openness (defender distance) | 0.28 (70) | −0.33 (7) | Smart's looks far more open |
| 3PT Shot Quality (full composite) | **1.14 (87)** | −0.13 (29) | Smart's looks *even better* than openness alone |
| C&S 3PT Shot Quality | 0.83 (80) | −0.16 (33) | same story |
| C&S 3PT Shot Making | **−0.86 (2)** | **0.10 (77)** | canyon |
| C&S 3PT Shot Making Efficiency | −1.37 (10) | 0.14 (70) | canyon |
Anything else need to be said? Grimes statistically had a higher 3pt%, but was far less open. His shot quality was garbage, while Smart's was very high. Next to Luka and AR, his 3 point shooting should be much better than Marcus Smart's, which makes up for his inferior interior and help defense.
## 1D. Off-Ball Movement
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Off-Ball Screen Poss / 75 | 0.39 (66) | **1.12 (86)** | Grimes |
| Movement Attack Rate | 5.47% (43) | **12.79% (72)** | Grimes |
| Movement Points / 75 | 1.00 (37) | 1.71 (54) | Grimes |
| Movement Scoring Impact / 75 | **0.26 (89)** | −0.07 (27) | Smart |
| Movement Speed Rating | −0.62 (2) | −0.18 (21) | Grimes |
Grimes runs far more off-ball motion — nearly 3× the off-screen possessions and much higher movement volume and attack rate. The one asterisk: his movement scoring impact graded negative (27th), while Smart's was strongly positive (89th) on tiny volume. Read alongside the openness data, Grimes' weak movement scoring is almost certainly a looks problem (contested shots off screens in Philly) rather than a skill problem — his play-type PPP below confirms it.
## 1E. Finishing & Rim Pressure
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Rim Shot Creation | −0.09 (59) | **0.44 (80)** | Grimes |
| Drives / 75 | 4.11 (55) | **5.46 (68)** | Grimes |
| Drive Assist Rate | 8.59% (56) | **13.51% (85)** | Grimes |
| Rim FG% | 61.90% (35) | **69.83% (70)** | Grimes |
| Finishing Talent | −0.71 (29) | **0.23 (78)** | Grimes |
| Contact Finish Rate | **26.00% (72)** | 19.78% (45) | Smart |
**Grimes adds a rim dimension Smart lacks:** he creates rim looks (80th), drives more (68th) and *passes out of them well* (85th drive-assist rate — a connective skill), and finishes far better (70th vs 35th rim FG%). This is exactly what you want punishing the closeouts Luka and Reaves force.
## 1F. Efficiency & Play-Type
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| True Shooting% | 54.42% (33) | **58.15% (57)** | Grimes |
| Effective FG% | 49.68% (26) | **53.44% (48)** | Grimes |
| Points Per Shot | 1.22 (40) | **1.33 (66)** | Grimes |
| Play-type PPP (value, pctile) | Smart | Grimes | Note |
|---|---|---|---|
| Spot-Up | 1.03 (63) | **1.12 (86)** | Grimes better spot-up value |
| Off-Ball Screen | **1.15 (99)** | 0.89 (15) | Smart's = Lakers system + open looks |
| Handoff | 0.80 (4) | **0.92 (67)** | Grimes far better |
| Cut | 1.24 (30) | **1.32 (79)** | Grimes |
| Isolation | **0.93 (87)** | 0.83 (20) | Smart can self-create a bit more |
| P&R Ball Handler | **0.85 (68)** | 0.78 (10) | Smart |
Grimes is the more efficient overall scorer (57th TS vs 33rd). The **off-ball-screen split tells a lot*: Smart's 99th-percentile mark is the Lakers *system* creating value around his cuts and screens — not his shot-making (his stable C&S is 10th) — while Grimes' 15th-percentile mark is contested looks that should invert on the Lakers. Smart retains an edge in the on-ball buckets (isolation 87th, P&R handler 68th), a residue of his secondary-creation reps.
## 1G. Rebounding
| Metric (value, pctile) | Smart | Grimes | Edge |
|---|---|---|---|
| Off. Reb / 75 | 0.75 (24) | 0.75 (24) | even |
| Def. Reb / 75 | 2.82 (18) | **3.69 (39)** | Grimes |
| Def. Reb Talent | −1.17 (21) | **0.08 (68)** | Grimes |
Offensive glass is a wash (both hang back — good floor balance next to two creators). **Grimes is a meaningfully better defensive rebounder for a guard** (68th talent vs 21st), a quiet plus for a smaller team.
## Pair 1 — Dimension Scorecard
| Dimension | Winner | Margin |
|---|---|---|
| Point-of-attack defense | **Smart** | Moderate |
| Off-ball / chase defense | **Grimes** | Moderate |
| Assignment difficulty | **Smart** | Large |
| Interior / help defense | **Smart** | Large |
| Shooting & spacing | **Grimes** | Large |
| Off-ball movement (volume) | **Grimes** | Large |
| Finishing / rim pressure | **Grimes** | Large |
| Scoring efficiency | **Grimes** | Moderate |
| Defensive rebounding | **Grimes** | Moderate |
## Overall Profiles — Pair 1
- **Marcus Smart** — an elite, versatile perimeter *and* interior defender who shoulders the toughest assignment, but a low-gravity, streaky, low-movement, low-efficiency offense. His entire value is defense and assignment toughness; his shooting was poor even on wide-open looks.
- **Quentin Grimes** — a 3-and-D movement wing/guard: high-volume off-screen shooter with real gravity and 88th-percentile catch-and-shoot reliability, rim pressure and connective passing on drives, efficient finishing, and solid guard rebounding. His off-ball defense is elite; his PoA defense and interior value are *not* Smart's, but still a great PoA defender who can fight over screens. Six years younger, and his shooting will likely improve next to Luka and AR.
**Pair verdict:** A clear slight offense-for-defense trade with an age kicker, but with a much younger player. Spacing, movement, rim pressure, efficiency, and youth go up; PoA defense slightly go down; and interior deterrence go down. The overall-impact gap will probably be neutral-to-positive, because most of Smart's edge is a defensive role the team may replace collectively, while most of Grimes' offense should climb.
Furthermore, I think Grimes (and Mamu) shouldering more of an offensive burden will release some of the pressure off of Luka and AR on the offense, which means they might be able to do more defensively. When AR had a smaller offensive burden, his overall perimeter defense was actually pretty good. In fact, AR got his start in the NBA by being a defender. The scoring came after.
# PAIR 2 — Rui Hachimura → Sandro Mamukelashvili
Sandro is **6'9", 240** — larger than Rui (6'8", 230) and only slightly smaller than LeBron (6'9, 250). He has played as a stretch 5 for most of his career, but he is basically the perfect size to replace LeBron and Rui. Playing as the center also impacts his metrics. As a starting power forward next to Kessler, only some of that role carries over.
## 2A. Perimeter Defense
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| Perimeter Isolation Defense | **0.29 (77)** | −1.12 (13) | Rui |
| Off-Ball Chaser Defense | **1.03 (90)** | −1.04 (24) | Rui |
| Ball Screen Navigation | −0.78 (27) | −0.63 (36) | ~even (both poor) |
| Passing Lane Defense | 0.41 (15) | **0.81 (61)** | Sandro |
| Steals / 75 | 0.73 (16) | **1.32 (62)** | Sandro |
**Rui is clearly the better perimeter defender** — 77th-percentile isolation and 90th off-ball chaser versus Sandro's 13th and 24th. **The heavy caveat:** those Sandro marks were logged as a center who was rarely isolated in space or asked to chase shooters; when he *was* switched out, he lost. He gambles more successfully in the passing lanes (61st) than Rui (15th). Whether he holds up slotted as power forwards is the biggest genuine unknown. Rui is the safer, proven wing-and-forward defender at the 4, but also isn't that good. Hell, Sandro still graded better at navigating Ball Screens than Rui, so maybe when playing as the 4 Mamu will see significant improvement at defending wings instead of just 4s and 5s.
## 2B. Interior & Help
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| Rim Protection | −0.34 (32) | −0.26 (39) | Sandro (both poor) |
| Rim Deterrence / 100 | −0.42 (16) | −0.10 (39) | Sandro |
| Blocks / 75 | 0.39 (40) | **0.85 (72)** | Sandro |
| Help Defense Talent | −0.37 (45) | **0.36 (77)** | Sandro |
| Help Defensive Activity | −0.41 (49) | **0.82 (80)** | Sandro |
| Screener Mobile Defense | 0.23 (77) | 0.27 (78) | ~even |
Sandro's 39th-percentile rim protection was shit for a center — but at the 4 next to Kessler, he doesn't have to anchor a defense. However, he is way better at help defense: 72nd-percentile blocks, 77th help talent, 80th help activity. Behind a real rim anchor, that makes him a useful secondary* deterrent and rotator — a far better use of his tools than the primary-anchor role he played on Toronto. Rui offered essentially nothing here (16th deterrence, 45th help). At power forward, Sandro is the better help/weak-side defender; neither anchors, and neither needs to next to Walker.
## 2C. Shooting & Spacing
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| 3PT% | **44.27% (95)** | 38.85% (80) | Rui |
| Stable C&S 3PT% | **40.00% (98)** | 37.19% (67) | Rui |
| ATB 3PT% | **45.70% (96)** | 39.82% (88) | Rui |
| 3PT Shot Quality (the look) | **1.81 (98)** | 0.39 (57) | Rui — far better looks |
| C&S 3PT Shot Quality (the look) | **1.60 (96)** | −0.19 (32) | Rui |
| 3PT Shot Making (result, adj.) | **0.71 (91)** | 0.38 (85) | Rui, narrowly |
| C&S 3PT Shot Making (result, adj.) | **0.64 (92)** | 0.26 (84) | Rui, narrowly |
| 3PT Pull-Up FG% | 36.36% (80) | **50.00% (93)** | Sandro |
| 3PT Versatility | 22.27 (21) | 19.63 (15) | ~even (both narrow) |
| Off-Ball Gravity | **1.26 (77)** | 0.79 (60) | Rui |
Both are legitimate floor-spacing 4s. Rui is the more efficient, higher-gravity spot-up marksman** (44.3% on 98th-percentile stable catch-and-shoot). Sandro is the more versatile shooter though. He can pull up off the bounce (50% pull-up 3, 93rd), which enables the pick-and-pop more with Luka and AR.
Applying the same look-vs-making lens as Pair 1 tells a more nuanced story than the raw gap. Rui's 3PT *shot quality* is 98th percentile (that's fucking nuts) and his openness (75th) confirms Luka/LeBron/Reaves manufactured a lot of nice shots for him; but his *shot making* is also 91st–92nd percentile, so he wasn't merely a benefactor of being surrounded by elite playmakers. Sandro is the reverse of the flattering case: he made his shots (85th shot making) on **worse-graded looks** (57th, and a 32nd-percentile C&S shot quality). So the raw 3PT% gap (95th vs 80th) overstates the skill gap — most of it is look quality Rui will partly leave behind, not shot-making that travels with him wherever he goes. So, Rui remains the better pure shooter, but by less than the percentages imply.
## 2D. Off-Ball Movement & Cutting
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| Movement Points / 75 | 2.37 (70) | **3.25 (84)** | Sandro |
| Movement Scoring Impact / 75 | **0.27 (90)** | 0.23 (88) | ~even |
| Movement Attack Rate | 16.18% (80) | **18.60% (86)** | Sandro |
| Cuts / 75 | 0.79 (55) | **2.10 (82)** | **Sandro, large** |
| Movement Speed Rating | −0.05 (34) | **0.21 (67)** | Sandro |
**Sandro is the more active, faster mover** — and a *much* more frequent cutter (82nd vs 55th), which matters enormously next to a passer like Luka who rewards rim-runs and dives into open space. Both convert movement efficiently (88th–90th scoring impact). This is a real, and slightly surprising, edge for the "big" in the pair.
## 2E. Finishing & Rim
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| Rim Shot Attempts / 75 | 2.17 (28) | **4.93 (77)** | Sandro |
| Rim FG% | 66.09% (53) | **71.31% (75)** | Sandro |
| Rim Shot Quality | 0.66 (78) | 0.69 (79) | ~even |
| Contact Finish Rate | 13.51% (28) | **26.19% (73)** | **Sandro, large** |
| Finishing Talent | **−1.24 (4)** (WTF❗) | 0.31 (80) | **Sandro, huge** |
**Rui is a genuine non-finisher** — 4th-percentile finishing talent, 28th-percentile contact finishing. His entire scoring value is the jump shot. Sandro attacks the rim more than twice as often, finishes better (75th vs 53rd), and finishes *through contact* (73rd), a valuable trait for a 4 who will roll and cut into traffic. On everything at the rim, Sandro is dramatically better.
## 2F. Efficiency & Play-Type
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| True Shooting% | 61.90% (81) | **63.88% (88)** | Sandro |
| Effective FG% | 61.14% (86) | **61.41% (88)** | ~even |
| Points Per Shot | 1.31 (61) | **1.42 (82)** | Sandro |
| Points Over Expectation / 75 | **1.98 (95)** | 0.43 (76) | Rui |
| Play-type PPP (value, pctile) | Rui | Sandro | Note |
|---|---|---|---|
| Spot-Up | **1.29 (99)** | 1.12 (86) | Rui elite (on elite looks) |
| Off-Ball Screen | **1.11 (98)** | 1.03 (92) | both strong |
| Handoff | 0.96 (82) | **1.00 (90)** | Sandro |
| Cut | 1.25 (56) | **1.34 (83)** | Sandro |
| P&R Roll Man | 0.99 (15) | **1.03 (30)** | both poor — *neither is a roller* |
| Isolation | **0.96 (93)** | 0.91 (84) | Rui |
| P&R Ball Handler | **0.93 (90)** | 0.82 (21) | Rui (real on-ball juice) |
Sandro is the more efficient overall scorer (88th TS, 82nd points-per-shot). Rui counters with elite spot-up (99th) and **95th-percentile points-over-expectation** — he massively out-shot his (already great) look quality, a real shot-making signal even after discounting for the looks. Both are pop/movement players. That isn't a problem next to Kessler, who does the rolling. Rui keeps the on-ball edge (isolation 93rd, P&R handler 90th), but we all know he lapses, like when he forgets that he can just shoot over Reed Sheppard.
## 2G. Rebounding
| Metric (value, pctile) | Rui | Sandro | Edge |
|---|---|---|---|
| Off. Reb / 75 | 0.77 (24) | **2.25 (73)** | **Sandro, huge** |
| Off. Reb Talent | −0.43 (46) | **0.49 (78)** | Sandro |
| Def. Reb / 75 | 3.48 (33) | **5.94 (77)** | **Sandro, huge** |
| Def. Reb Talent | −0.90 (32) | **0.91 (87)** | **Sandro, huge** |
**Sandro is a comprehensively better rebounder on both ends** — 87th-percentile defensive-rebounding talent versus Rui's 32nd. Even discounting for the fact that some of this was compiled at center, he will be a meaningful upgrade. Rui rebounded like a weak wing playing out of position at the 4 — a real hole this swap closes.
## Pair 2 — Dimension Scorecard
| Dimension | Winner | Margin | Note |
|---|---|---|---|
| Perimeter defense | **Rui** | Large | *Sandro's marks earned at C* |
| Help / weak-side defense | **Sandro** | Moderate | Fits behind Kessler |
| Rim anchoring | neither | — | Kessler's job now |
| Catch-&-shoot efficiency | **Rui** | Moderate | *On elite, borrowed looks* |
| Shooting versatility / pull-up | **Sandro** | Moderate | Pick-and-pop |
| Off-ball movement / cutting | **Sandro** | Large | Feeds off Luka |
| Finishing at the rim | **Sandro** | Large | Rui is a non-finisher |
| Scoring efficiency | **Sandro** | Moderate | |
| On-ball creation | **Rui** | Moderate | |
| Rebounding (both ends) | **Sandro** | Huge | Closes a real hole |
## Overall Profiles — Pair 2
- **Rui Hachimura** — a forward whose value is an elite, high-gravity catch-and-shoot jumper and some on-ball isolation juice, wrapped around a body that can guard slow wings and small bigs. But he is a **poor rebounder and a genuine non-finisher (4th-percentile finishing talent)**, and his gaudy shooting may have been substantially manufactured by his star teammates.
- **Sandro Mamukelashvili** — a power forward that can stretch to the 5: pick-and-pop range with pull-up ability, strong rebounding on both sides of the ball, active high-frequency cutting, efficient rim finishing through contact, and help-side shot-blocking that fits far better as a secondary deterrent than the primary anchor role he was forced into. The swing variable is whether he can switch onto wings — his existing marks are poor but were earned guarding centers.
**Pair verdict:** Read correctly — this trades Rui's proven (and partly borrowed) elite 3pt and mid-range shooting for better rebounding, better finishing, better cutting/movement, better efficiency, better overall spacing, and help defense protection. The only thing they lose is proven elite shooting in the regular season and playoffs. On the metrics, Sandro is better in many different areas and by larger margins.
# Conclusion
In both pairs, the Lakers trade a veteran for a younger player who is a better offensive fit around Luka, Reaves, and Kessler while only moderately weakening their defense, if the defense is weakened at all. Both moves are defensible and roster-fit-positive.