I think he will fight King. Never changed my opinion on three certain match ups (Kid vs BM, Sanji vs Queen, Zoro vs King) since the beginning and look where it's going. Same old pattern and I'm pretty sure that's what's going to happen.
Rooftop Kaido was pretty much just an overgrown punching bag, just there for all those guys pulling out some feats until Luffy got his PU. It was like "dodge named attack" -> "spam your own named attack" on repeat, until Kaido decided he's done with playing around.
None of them bar advCoC Luffy fought him in continuous clashes.
And that is imo what's missing even for Zoro. Opponents won't just fly or run into his all out attacks. Especially a guy like King, who's presumably pretty fast and super mobile. If Zoro had difficulties connecting Hiryu Kaen against Dragon form Kaido, King won't just be target practice.
And outside of Asura and those "pseudo advCoC"-Enma attacks, Zoro still has relatively normal stats, whereas Hybrid King, especially while boosted by momentum via flight, will presuambly be a banger in power, like Denjiro on roids with some fire and wings (what imo will defeat Marco, who ran out of phoenix flames, beforehand).
Zoro is going to be untouchable for those guys, when he has learned to control advCoC, so that all of his three swords are ready to be covered in CoC, whenever he blocks, parries or attacks (basically being a top tier swordsman).
For now he only showed the latter, while it's still only generated with the help of Enma's gimmick.
My hopes for the King fight:
He experiments with his Enma haki (= his CoC haki basically) and therefore uses it for blocks and stuff, while we addtionally see a new pound cannon