“Yamato’s a shit character” is not a fact so much as an opinion, albeit a fairly popular one among a very specific type of person; Momo was in the air for the majority of the battle trying to generate flame clouds, but even if he was there for it, mentioning the leader of the alliance and the whole fucking reason anyone is there to fight Kaido isn’t half as bizarre or damning as you wanna believe; Yamato fought against Kaido for longer than anyone who wasn’t Luffy, and every single other character didn’t even show up, did she have to beat her father single-handedly for you to like her?? Because holy shit, if that’s your bar to clear, literally everyone else in the series is just as useless as you.
And yet Luffy mentions Momo but not Yamato. Why? It’s not because Yamato’s “actively fighting Kaido” like you’re saying (In fact she’s just standing there contributing nothing). It’s simply because Luffy doesn’t care about Yamato as much as he cares about those four. They only just met and have no relationship
And dude, I don’t care about how strong she is. I like characters that are interesting, which Yamato isn’t. Usopp is way weaker than Yamato but I like him way more. Why? Because he’s actually interesting while she’s fucking underdeveloped and boring. I MIGHT have liked her a bit more if she beat Kaido because that would actually give her purpose as a character outside of being hollow merchbait