Zoro needs to get stronger, like get better with Enma and perhaps he isn't even aware of his CoC, thats if he wants to do be relevant against a Top Tier like Kaido. So he is fighting King, thats why Oda is holding King's potential so much
The whole point of both Zoro and Sanji saying "Luffy will surely win" at the same time, then yelling "Screw that" towards Bao Huang's announcement about Luffy's defeat is that they can't defeat Kaido, but Luffy does.
If ZKK is supposedly going to happen then it will be against a near death defenseless Kaido, with Zoro giving the final lethal blow to kill him.
Zoro fans started wanking Zoro and overinflating his feats too damn much for the sake of downplaying Luffy, shitting on Sanji and the Calamities, now they need to wake up for the reality. Thats how it is