So all this time Zoro thought that CoC is a captain thing and is for fodder control.
Sommers himself confirming that Zoro is using him as a practice dummy.
Zoro can use ACoC but he didn't know exactly which it is and hence it is inconsistent, in some attacks it is present and in some it is absent.
Then he realizes that he is a conqueror as mentioned by Luffy and Gaban and that as a conqueror the weak should not be able to stand against him.
Hakiman agenda down the drain. Airbars coated in ACoC by swordsman Zoro and WiFi ACoC haki by swordsman Zoro.