One thing that Buggles me about this ZKK stuff, is that the Zoro fans don't even know what that means. Like, if you mean by ZKK that "Zoro is going to kill Kaido" then that means that Zoro will be the fodder executioner, like the faceless and nameless fodders who killed Roger.
What's the pride in it? Are Zoro fans seriously going to be proud of Zoro killing already defeated guy? First, it goes against Zoro's character, as far as I can tell, Zoro is not going to kill already defeated and helpless guy even if it's Kaido himself. Second, if Kaido is meant to be killed after being defeated, then based on the narrative, it is much more impactful and logical if the executioner is someone from the scabbards, like for example Kinemon. But, if by ZKK you mean that "Zoro is going to kill Kaido by lending the last blow"
then what you're saying, is that Zoro will be the one to defeat Kaido and get the credit for it.
Even the most dieheart Zoro fans have to understand that that's not going to happen. In every arc, whether Luffy defeats the villain or not, whether it fits Luffy's character theme or not, Luffy always gets the credit for defeating the villain of an arc. Luffy always lends the last blow, you can go back and watch/read every single chapter or episode, Luffy always, and I mean ALWAYS lends the last blow.