Had yesterday with Sentinel a talk about Akainu, who most like used adv CoC in his punch to Kill Ace and also to hurt and give Luffy a scar.
It is official that Luffy is a Zoan user and he heals very fast in comparison to other humans, yet of all scars, only one stayed(if we not count the cut under his eye) and that is from Akainu attack.
We see Kaido got cut, got punched and pierced, but the only remain scar was the one of Oden and Zoro's as example, both used adv CoC in their attack. I believe Akainu is also very skilled with adv CoC and can fused it with his df.
I think Akainu will be the only Admiral who has awakening+all 3 advanced haki types.
As example he show glimps of Future sight, he showed adv CoA when he blocked Whitebeard attack and he also most like have adv CoC.
I assume this one:
Akainu: Awakening+Adv CoC+Adv CoA+Adv CoC
Kizaru: Awakening+Adv CoC+Adv CoA(first level)+good CoO
Fujitora: Awakening+Adv CoO(highest lvl)+Adv CoA(first level)+CoC
Greenbull: Awakening+Adv CoA(highest level, Black sword like Mihawk)+good CoO+CoC
Each Admiral will pose one great haki type, all of them will have all haki hype, at least one advanced version.
And of course awakening, if they also get adv CoC, it would make them even more powerful, I look forward to see them in a all out battle.