That doesn't make any sense because Zoro consistently using against Kings without any issues.
When King try to blitz Zoro, he blocked King's attack, coated demon splitter with ACoC in an instant and countered King's attack.
At the end of Zoro's battle against King he released overwhelming ACoC haki. Dragons style is when he is using overwhelming ACoC haki. KoH is when he is using overwhelming CoA haki with ACoC haki.
When King try to blitz Zoro, he blocked King's attack, coated demon splitter with ACoC in an instant and countered King's attack.
At the end of Zoro's battle against King he released overwhelming ACoC haki. Dragons style is when he is using overwhelming ACoC haki. KoH is when he is using overwhelming CoA haki with ACoC haki.
Zoro is the only character who coat attacks with CoC and not AcoC?
The guy didn't even realize he had CoC when he attacked Kaido, it's unlikely he learned aCoC in such a short period of time.