The pattern displays that CoC came off exactly when Asura did which made many realize that probably Asura is mandatory for Zoro in order to use CoC. In reality that's far from confirmed, it's not that much of an evidence per se. However on the other flip of the coin I would not be left in awe if that was the case. Zoro is already so powerful like this, imagine if he was allowed the chance to use his ACoC all the time. It's feasible though, depends on our sensei.