So after zoro vs king, zoro should more or less be completely exhausted, due to damages taken during this fight + mink medicine wearing off (doubling the damages). On the other hand, it would make sense that zoro now has much better understanding of Adv CoC and is capable of delivering a cut that is even stronger than his previous ashura cut.
Zoro's unaware version of adv CoC can already scar kaido, so current zoro's awakened adv CoC ashura should do even more damage. Post-king Zoro is top-tier.
But the problem for ZKK is that it would not make a lot of sense to make zoro be readily available for any more fight, given his current condition.
Note: by ZKK i mean delivering a death blow to kaido, but Luffy will still beat kaido alone.