But ZKK does not constitute Zoro defeating the main villain, it revolves around him killing the main villain. People on sides of the ZKK argument seem to really not understand this. One that is obvious and extremely clear at this point is Zoro isn't taking away Luffy's thunder of claiming victory against the first Yonko. That much is clear by the obvious representation at this point of having, repeatedly, the story (i.e. Luffy, Momo, Yamato, the Narrator) and the fact that Zoro is having a much more extreme battle with King.
THAT is far different from Luffy winning, Kaido potentially getting up, then Zoro slaying him. This preserves Luffy's victory. The former does not. I harken this to Luffy vs Don Krieg where Gin knocked out Krieg after Luffy won. This is far different from Zoro cutting down Morgan, which clearly was a set up moment where Luffy trusted Zoro to cut him down before Morgan attacked Luffy.
And I really wouldn't compare Hody to any of that lol. He was yet another weakling that was exemplified by a post-timeskip power scaling where the crew just absolutely wrecked the New Fishman Pirates. Drugged Hody wasn't beaten by Zoro, that was still Luffy.
tldr: ZKK, if it occurs, will not result in Zoro taking over the fight against Kaido from Luffy and downplay that accomplishment. Luffy will win. Zoro killing Kaido is an entirely different event, which is irrelevant to the fight. Why i can't get behind the Hody or Morgan comparisons lol. Compare it more to Krieg.
Read the above response. ^