@Cinera
Oda will not miss all this build up for Zoro and leave it with just that King vs Zoro. I am pretty sure.
In previous arc Zoro never express this amount of attachment and emotions that we saw in Wano such as:
feelings of anger and a sense of compassion and happiness with the Ebisu village (one of the poorest in the land).
Zoro is the one who testified more to the suffering of the Wano people, the extent of corruption in this country,
It would be ridiculous if Oda ratified everything that happen to this people just because Luffy is having fun against Kaido..... (it would be the worst narrative ending in One Piece). Kaido is the cause for the downfall in Wano, and him becoming an ally would be an insult to this guys.
I cant accept that this Zoro is okay with Kaido coming out alive from Wano.