How can you believably set up Zoro and King, though? Let's say King does come to the top of the dome, what would force Zoro specifically to fight him? Put yourself in Zoro's shoes, he's in the middle of battling two Emperors, and King suddenly shows up. How is he weighting his options? He'll obviously choose the greater threats which are Kaido and Linlin.
And now King, why would King specifically choose Zoro? Wouldn't he go after Luffy who's the most perceived threat to Kaido there? Or Momonosuke, the character he hasn't stopped mentioning since he was freed by Sanji.
I ask this as someone who likes the Zoro/King matchup, but what would reasonably bring it together at this point? Oda had the perfect set up just a chapter ago. Zoro flying with Marco and battling King, the last obstacle to Kaido, but Oda completely side-stepped it in favor of the Emperor face off.