i think three kind of haki (coc,coo and coa) are a classification to learn the basic use of haki (the same in maths when the kids learned addition and substraction) but when you have more level you know than substration is addition with negative number so the haki is the same coa is "adv coc"...
mihawk never said than zoro need to coat his sword with coa he said with "haki"
there are two kind of coc: the coc who use luffy, shanks and roger and the coc who use zoro, mihawk, oden and ryuma (black swords)
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