The possibility was always there, Kaku said that Zoro's willpower created an illusion and willpower is haki.
Also this should get animated before any in story confirmation. Remember this, if she has a golden aura it's CoC.
I do think that zoro used acoc in the ashura but it was unconscious coating and beneath crude and clumsy , zoro actually started controlling acoc in ch 1033
The gold is conqueror's haki and the black lightning coming out of Kaido's weapon is CoC coating, Luffy has the aura and the coating, not that hard to understand.
As for why Kaido doesn't have the aura, maybe it's a Luffy and Zoro thing, if Yamato gets the aura then it's a good guys thing.
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