Luffy had CoC, and unlocked Future Sight.
Luffy had CoA, and unlocked AdCoA.
Luffy took the principle of AdCoA and applied it CoC.
^All shit that makes sense.
Zoro, with no indication whatsoever that he can use CoC, nor does he even know it himself, nor was there any buildup whatsoever to it, unlocks it out of thin air, and scars Kaido.
Hmmm... I wonder.....