It's hard to tell whats the indicator for CoC. If we say it's the smoke, then we can't say it's the seeping haki, and if we say its the seeping Haki, we can't say it's the smoke. One has to be and indicator for CoA, while the other has to be an indicator for CoC. If we say both are CoA indicators, then there will be zero visual queues for CoC. It's just not clear cut at the moment.
However there is no precedent yet for stopping an AdCoC infused attack with just CoA, but we can't rule out the possibility if someone's barrier CoA is just extremely powerful. Without there being a precedent, it's the better bet to assume Zoro isn't using it.
I will say this though, Lucci's CoA is very impressive, as he is fighting a powerful Swordsman barehanded.
However there is no precedent yet for stopping an AdCoC infused attack with just CoA, but we can't rule out the possibility if someone's barrier CoA is just extremely powerful. Without there being a precedent, it's the better bet to assume Zoro isn't using it.
I will say this though, Lucci's CoA is very impressive, as he is fighting a powerful Swordsman barehanded.
So… until stated otherwise, this is all the smoke ever is… no need to start claiming that maybe the smoke is now randomly a sign of AdvCoC when no one has ever implied that