Im sure Zoro will hold Ashura more if he unlock more and more CoC, as we know Ashura should be adv CoC form, I can see in the moment where Zoro push his CoC he can use that form far longer in a battle.
Ashura is really rare and it make sense why Oda didn´t want to use it against fodder like Pica or Doffy.
Kaido see the aura around Zoro most like and see Ashura, the attack himself is not just adv but the whole Ashura form is adv CoC.