I don’t really think it’s anything more an wind from the attack speed.. Oda has always shown this black lightning streak that come from the weapon to indicate advCoC was used… just look at Kaido doing many times do recognize it. I don’t really mind at this point if Zoro was using advCoC, but Oda is simply not showing the way it always is. Why should it be different for Zoro right?
u cant scar kaido without coc
luffy said his punches without coc were to shallow
when scabbards cut kaido with totska kaido said its to shallow
zoro cut kaido with enma with tatsumaki no scar either
u need coc to permanent damage kaido