This is the only thing blocking the ZKK agenda from being 100%. I'm like 80% confident in ZKK.
I cant share your convincing here, but thats fine. I cant see a way where Zoro would kill Kaido, with my biggest issue is the mentioned above. Zoro also has no intention in killing kaido, why would he? His goal is not related to Kaido at all, Kaido is just a step on Luffy ladder and this is all whats important for zoro in Onigashima, so also for Zoro, only Luffys decision how to deal with Kaido is important. If Luffy decides Kaido needs to die and says so, Zoro wouldnt have a second thought about killing Kaido, but we all know Luffy, he wont decide that. He would take his win over Kaido, Kaido will be unconcious and when Luffy is about to leave, someone will take the situation to finish the job. If thats Kid, Law, Blackbeard or whoever TF it is, maybe he even Big Mum, isnt that important at all, but i cant imagine it being Zoro.