There's an entire chapter named enma for that purpose
Enma makes Zoro's haki flow, this is concept of Ryou, and makes a lot more sense than you saying that zoro simply learned adcoc in minutes without even knowing how to use basic coc.
Whatever
The fact is that enma is the strongest tool in the verse, giving free advanced haki coating if the user has haki enough to handle, pretty powerfull.
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