If anything, from my perspective, this last chapter was the final nail in the coffin that ZKK is indeed going to happen.
Now, the theory of ZKK (with the proper analysis about the themes, the foreshadowing etc.) is something you can easily find on the net, by people like
@Fiji and
@Cinera
Leaving all those things aside, let's add some new elements.
1) Zoro was able to leave a scar on Kaido already. Despite that, we haven't even received a Zoro named chapter yet which, if Oda is doing the reverse order of Sabaody, will be the last one. Zoro is set have a significant moment despite already having accomplished all those insane things. I wonder what that could be.
2)Zoro is now being given time recover, meaning that he will be ready to perform other actions again later on. His role by the arc is by no means over and there is also no proper setup where you would feel that this is the case.
3)Zoro's Hiryu Kaen missed Kaido, an obvious foreshadowing that it will hit him later on. In this attack Zoro does the same pose Ryuma did to slay a flying Dragon in the Flower Capital. Luffy is set to defeat Kaido like he proclaimed for hundreds of chapters. But Zoro will be the one to finish him off for good under the eyes of the citiziens of the Flower Capital, while Kaido is flying in his dragon form, once his zoan recovery will have partially kicked in.
This is honestly going how I thought it would.