Yeah i agree.
It is the most hyped ability in the manga , probably how the 20 Kingdoms were able to take down the Ancient Kingdom.
Also Mihawk definitely has CoC & Double Layered Eyes.
When do you think he would fight Zoro?
I also agree with your opinion on how Shanks & Mihawk mirrors Brook & Zombie Ryuma with Brook later saying he never used his full power on me.
But with so many different factions in the Final Arc (Blackbeard Pirates, Im & Gorosei, Holy Knights, Seraphim, Admirals) where would Mihawk & Cross Guild fit in, in your opinion?