Firstly how would Kaido defend against it in the midst of a fight especially if he's distracted by fighting Luffy and others?
Secondly Ashura mentions it's not over until Kaido's head is severed. I wouldn't be surprised if at the end once Luffy deals the finishing KO, Law separates his head from his body. Law's the most suited to do this with his DF ability and Oda wouldn't even need to kill Kaido, since he doesn't like killing villains.
Secondly Ashura mentions it's not over until Kaido's head is severed. I wouldn't be surprised if at the end once Luffy deals the finishing KO, Law separates his head from his body. Law's the most suited to do this with his DF ability and Oda wouldn't even need to kill Kaido, since he doesn't like killing villains.