Well, it's Kaido after all...
But the moment when Luffy and Co are too exhausted, Marco will appear - in awakening - to regenerate them again since I believe Marco is the pheasant here. Also, we have yet to see whether Luffy used AdCOC with Snake Man or not.
In addition, don't forget, everything which Luffy shows at the beginning which is also his best skills, there is usually a hint that Luffy might show something completely new during the battle, perhaps a new G4 mode?
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Well, we have to either see the full summary or panels how Kaido actually got damaged.