Akainu having ACoC would be reasonable. Question being, whether he can combine his Magma with it. Otherwise it wouldn't compliment his fighting style much.
@MarineHQ @Elder Lee Hung
Kaido used AdCoC with his magma dragon so I don’t see why not.
But anyway, I think Haki coating in general is misunderstood as Oda hasn’t explained it. If Akainu coated his magma in Haki, that wouldn’t negate the heat of his own magma, it would simply allow his magma to injure other logias and/or overpower lesser Haki that was used to defend it. Similarly, if Akainu coated his magma with AdCoC, that wouldn’t negate the heat of his magma, it would simply enhance the effectiveness of Akainu’s attacks. Haki literally means “willpower”, so conceptually Haki is intended to enhance the effectiveness of your own attacks, not nullify your own powers lol, IE “I will my magma to burn this logia character and therefore it does, unless he defends himself with his own stronger Haki as he is using his willpower to protect himself.”
If Haki was a power that only worked with fist fighters and swordsmen, then the Government and the Navy would never feed their characters Devil fruits and would exclusively train them in Haki use but that’s not what we see.