Who do you think would defeat kaido
Luffy who has said he would defeat kaido like ten times or zoro who would defeat king and come out of. no where to kill kaido. Because who ever deals the last blow is the real winner, like it was the Blackbeard pirates that defeated and killed whitebeard not marine(akainu). So I think you get my point
They dont get that Oda like to draw hype panel, and I am sure that he clearly has a perfect opportunity to show a dragon flying over a capital in One Piece which will get chop by a monstrous samurai.
Do you think that Oda give a shit what fan think? If he want to draw something epic, like in his first volume monster more than 20years ago, he will definitely let ZKK happen. That is what fan have to understand. If Oda want that to happen, no amount of excuse are enough to stop him.
So let wait. I believe that Oda will not skip this opportunity. Plot wise is enough to let this happen.