How I see it is this.
Kaido will be defeated.
He will be chained up by momo who will present him to the citizens of wano.
During his speech either kidd or CP0 takes initiative to kill kaido most likely CP0.
CP0 killing kaido will be reminiscent of kuma in thriller bark. Most people donβt have a brain and say kuma=big mom which isnβt the case because she doesnβt fit anything similar to kuma in thriller bark.
Kuma is a villian in the arc who comes at the end when the pirates are exhausted and beat up. Thatβs CP0 which was foreshadowed In 1003.
Thatβs why kaido will die to CP0(most likely)
In the legend of momotaro the villian was chained up after which will happen to kaido. He will then die but not in the way he wanted.
A theory like ZKK doesnβt work because it achieves kaidos dream in dying in a glorious battle. CP0 killing kaido chained works because kaido would die without being able to fight or protect himself.
CP0 also has to reveal themselves at some point.
Remember kuma came after moriahs defeat the same will happen with CP0.
Oda said the ending of wano will be surprising and CP0 doing this actually fulfills the kuma role oda has set up with CP0.