"Enma unlocked Zoro's CoC"
- Throughout Wano (ever since Zoro picked up the blade and before King's fight) Enma never did anything that Zoro didn't want it to do, when he wasn't distracted.
"Enma has Oden's Haki"
- Proven wrong plenty of times. That Tenguyama fella simply telling Zoro (and that's Oda telling us) that it draws out Haki is more than enough, nothing about storing anything though.
- Enma doesn't draw out Haki, it draws out Ryu (CoA). It doesn't draw out Observation Haki or Conqueror's Haki either.
"Big Mom said that it's not an Ordinary sword"
- Tenguyama said it first. Only sword we've seen so far with the personality to test a user and nearly kill them.
"Zoro used AdCoC without knowing due to Enma."
- Zoro himself stated "I just put everything I had into that attack". The guy has been using advanced armament since Alabasta, and it was confirmed it was that in Udon when Luffy was training.
With that in mind and Zoro releasing his all, he unconsciously released CoC & hence put it into his attack surprising Kaido.
- The next time we see Zoro putting his all out there, we see him consciously using AdCoC against King. Those in denial would be correct in a sense if he could only use the advanced coating on Enma, but he used them on all 3 of his blades and was turning them off and on until he beat King.
Everything he does is by himself and has no need for a Devil Fruit or Cyborg body parts