Because I see a lot of Zoro haters here , making fun for anyone who believed in ZKK : ZKK was never a theory about how Zoro would defeat and kill Kaido . It was a theory that said that after Luffy fights and defeats Kaido , somehow Kaido get back up and then Zoro kills him. There were an abundance of evidence that made this theory plausible. However , at the same time , there never was a moment in the history of One Piece that another character than Luffy could end the main arc antagonist life , making the ZKK extremely difficult to happen . And as it turns out , it will not happen . It was a plausible theory that did not happen . Relax