Train in the sense that he got better at using it, since after knocking out Luffy Kaido implied he got cocky with his new ability without mastering it
I don't think you can increase the strenght of CoC at all but only train to master it.
I mean we can all manipulate the story to push a certain narrative but that doesn't make it 100% true especially if the author doesn't intend for it to be that way.
Clearly at that point Zoro knew Luffy for as long as he does know now to properly judge him /s
:sighting:
Has far as Zoro was...
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