Class 1-B's cavalry battle formations were ridiculous.
No wonder the only reason any of them made it to the third round was members of Shinso's team forfeiting. The choice of riders is terrible.
Team Kendo - Probably the worst offender. Not having Tokage as the rider is insane. Her hands would be freed up and she could send them flying all around the arena, snatching up headbands with ease, all the while keeping her headbands out of reach by detaching her head/neck and keeping it under her body (only rule was 'around the head or neck'). Plus, Kendo as a horse is also way more advantageous. How exactly is her quirk useful as a rider? I feel like giant hands would only make it more difficult to snatch headbands (not precise enough) but she could serve as a single horse (Shoji-style), holding up all her teammates, freeing up Komori to distract other players with mushrooms and Yanagi could telekinetically lift headbands. This team should have dominated.
Team Tetsutetsu - Shiozaki (not visible in the pic) should've been the rider. She has a quirk that gives her long prehensile hair and the goal is to protect HEADbands. Of course, defense shouldn't have been that big a problem for their team, regardless of who's the rider. All the rider has to do is bend down a little and let Awase bond the headband to their head. Still, Shiozaki is the best choice, being a top in the center would allow her to effectively spread her hair out and snatch headbands. Tetsutetsu meanwhile should've been the "strong front horse" like Kirishima (would've been fitting given the running gag of them being so similar, particularly during this arc) and Honenuki could've still effectively softened the ground as a flank.
Teams Rin & Kamakiri - For some reason these guys decided to be teams of two (also for some reason, Team Kamakiri is labeled as Team Tsunotori, even though she's clearly the horse). Unfortunate, as they could've formed a great quartet: Shishida as the front horse in his Beast Mode would've let given them a huge physical advantage, with Kamakiri as the rider (he can grow blades all around his head to protect the headbands), and Tsunotori and Rin could keep up with Shishida as horses by holding on to tufts of his fur and standing on Tsunotori's flying horns; thereby freeing them up to attack others with scales and (non-remote controlled) horns.
Team Kodai - Fukidashi should've been the rider. He's utterly being wasted in the back like that. For god's sake his quirk comes from his voice; the only thing his quirk can affect here is Kodai's butt. But as a rider he can use his quirk freely and so can Kodai: she could shrink the headbands around his substantially thinner neck, making them harder to steal. Bondo's great where he is as the front horse: he's big, he can spit glue at other players, and the rider can have him spit a bit of glue on any headbands before putting on.
Team Monoma - The only one doing it right. Monoma as rider lets him easily use all of his teammates quirks and copy other players'. Tsuburaba as the front horse provides extra shielding. Kaibara (not visible in the pic) isn't particularly useful as a horse, but again, him lending his quirk to Monoma is great: a rider should be able to protect his headbands quite well when rotating their head around at high speed. And Kuroiro... well, he's kinda useless in this situation, but there's nothing we can really do about that lol.