
Punk Hazard is the Prime answer that akainu's magma isnt stronger nor superior to kuzan's ice power
(A). The 50/50 split CONFIRMS it. If kuzan even lacked something the fight would be off in 3-5 days let alone 10 days with 70/30 split or more.
(B). People think kuzan's fuit was inferior to magma and was able to keep up with akainu cuz of his training through garp or more refined haki. This is just headcanon and wrong.
(C). Both devil fruits cancel out eachother, Akainu has constant flowing magma but people tend to forget that Kuzan's base form also surges with ice as we saw the fumes on him unlike regular ice cubes he doesnt need to double his output to match akainu's magma, he can literally FLASH FREEZE an entire ocean(island scale lvl)in 1 second or less than second in just his base form.
(D). Both were extremely CLOSE in Haki not devil fruit cuz devil fruit doesn't make sense. If kuzan lacked even a bit of haki he would have became a donut and vice versa for akainu.
(E). Akainu DOES have the most lethal devil fruit but it only works depending on the user and the opponent. Whitebeard's heart attack costed him a hole in stomach just LIKE JOZU's looking back costed him a full one hand. Akainu's devil fruit is like an enma of devil fruits but just as enma kuzan's devil fruit is like the heaven sword parallel to enma.
(F). It was the battle of WILLPOWER/haki not devil fruits. People also forget that Akainu and Kizaru were called MONSTER ROOKIES just as they joined the marines before they had their devil fruit.
(0% chance for a user of most lethal power and a user of fastest devil fruit to join marines at the same time in the same branch)
For akainu and kizaru to be strong before their devil fruit makes sense cuz they were from most aggressive sea and a natural fighter as depicted by child drawing of akainu.
Akainu won only by HAKI.