So this confirms one think, Zoro has already unlocked CoC because him used against Kaku.
Ashura is Zoro personified Haki=spirit.
Ashura is a Mode for Zoro used AdvCoC.
Only way to defeat King is a CoC and Fire cutting Techniques.
All RH from Gokos has CoC.
Enma is a PU.
Kinga>Marco and Katakuri.