is it? There has been absolutely no indication that Zoro vs King will happen. Zoro has never even met king and it is questionable how he can even fight king given that he can't fly.
He's also never beaten a single character who was on yonko commander level.
there's no logical reason why Zoro should fight someone like King. They've had no interaction and there's nothing that suggests that Zoro is that strong. Not only that but you have characters such as Eustass Kidd, who is portrayed as Luffy's rival, who is yet to have a single fight in the new world yet and would be much better suited to fight King.
Kidd has consistently been portrayed as rival and one of the most important supernova. Idk why Zoro would fight King over him. Wano isn't like enies lobby, there are other factions apart from just the straw hats who are going to be fighting the beast pirates and hence I don't see the straw hats getting all the big fights.
The only reason for Zoro vs King is a faulty powerlevel argument that has no basis in the manga.