Copy paste from the Adv CoC Zoro thread
Zoro is ALREADY master of Adv CoC, just he doesn't know that Adv CoC is the power he is using
He is doing things instinctively, without knowing that these things really are, but he is doing them, which shows that he is a Haki genius
Here it's explained very wellin a good analysis
Zoro needs awareness, but already has power and skill
https://www.sportskeeda.com/anime/one-piece-zoro-s-conqueror-s-haki-explained
Because... how could Zoro achieve feats like these otherwise?
Or how could he release Adv CoC at will
And change its intensity at will
For multiple different purposes and moves?
It's also consistent with the series showing Zoro unconsciously using Haki pre timeskip, both CoA and CoO, and CoC as well since Ashura is clearly CoC
No wonder that Gaban noted that Zoro is QUITE AT EASE with this power...
That only makes sense for a character we saw EQUALLY MATCHING in Haki and physical strength someone who is a confirmed top tier with confirmed super duper Haki
See how Nusjuro struggles yet can't overpower Zoro (who isn't using even Asura or King of Hell Style, let alone a combination of these... not even three swords!)