Kaido was ok right after and luffy was goin all out brute force against kaido. kaido executed 2 tatsumaki's and he was fine like no shit happened to him from that intense beating.. which is exactly my point gear 4 th attack all get absorbed and do barely any damage to kaido.. just voz the barrage was intense doesn't mean it did any damage at all for that fact.. kaido 's reaction was no different that when all SN's attacked him.. and he dusted it off
compare that to this
kaido literally almost slapped luffy with a thunder bagua right after the red roc while casually brushing it off when he had to be covered by big mom when it was after the g4 barrage.
so tanking all of his Acoa attacks and retaining no damage.. and then suddenly dodges when its red hawk...even luffy mocks him for it just look at the dialog.. luffy alludes and specifies that Kaido has dodged THAT one
that alone is a huge reach let alone calling that fire hurts kaido. kaido's scale toughness has been the only thing hyped up all over this arc. it has never been said that kaido is weak to flames at all.
lets see the difference between Gear 4 attack and red roc
dragon kaido was almost knocked out temporarily and big mom covered for him after that g4 barrage. while he casually got back up after the red roc and almost slammed luffy with a thunder bagua.
those panels with his internal monologue were supposed to show luffy's growth in advanced armament / learning techniques which can hurt kaido and had nothing to do with fire.
there's no point in debating this. let's see whether luffy uses fire to hurt and defeat kaido or if he uses adv CoC/ adv CoA techniques which he actually grew into to hurt him.