Kaido is stronger than Luffy ofc but even In base Luffy can put up wakened Luffy are stronger than KaidoNo way Luffy has grown a lot though He has enhanced his devil fruit powers with gear 4 and multiple variations of it with Snake, Bound and Tank His haki has grown to where he's capable of fighting with commander lvl characters but at If my theory is correct, and fier is Kaido's ultimate weakness, that means that other characters can join the fight against Kaido With exception of Luffy and Zoro, I haven't seen any supernova use fire, as far as I can tell Kid, Law and Killer can't use fier That means that we might see fier ability users joining the fight against Kaido
Luffy Vs Kaido Theory Can Luffy Beat Kaido Gear 5 One Piece
Luffy gear 5 vs kaido full fight