don't know what would change has Zoro learns about COC usage.
there’s a way Haki Kind of does what you willingly intend it to do… Hence why Gaban tells Luffy the only thing he needs to damage the Holy knights is using his CoC
You have to INTEND to damage them with CoC specifically and you can do it
Zoro technically can already damage the Holy knights but if he’s like using KoH that adds COA on top of his CoC then he’s wasting haki… Zorp has to understand that he Has CoC first of all, and then understand it’s only CoC that works on these guys so that he doesn’t waste CoA… And then he can cut these immortals with intentionality