I think the idea comes from the fact that Kaido didn't even try when he knocked Luffy out in one hit, while Luffy truly tried to hurt him.
Yes, Luffy now has the power to damage Kaido internally, but we have yet to see any remote idea of Kaido even remotely getting serious. What happens when Luffy damages Kaido? What happens when Kaido gets serious? Luffy has been pretty overconfident with this one and I almost expect him to lose at least one more time because of it.
Yes, Luffy now has the power to damage Kaido internally, but we have yet to see any remote idea of Kaido even remotely getting serious. What happens when Luffy damages Kaido? What happens when Kaido gets serious? Luffy has been pretty overconfident with this one and I almost expect him to lose at least one more time because of it.
As the proverb says a wounded beast is only more dangerous.