Alone the fact that WB had a df power, advanced CoA and CoC and probably also awakening make it clear that Roger advanced CoC was similar like Zoro ashura.
@comrade @Red Admiral
It seems like both Kaido and Whitebeard also have advanced CoC, so how could Garp,Roger and Shanks match these guys?(I mean they had all powers which Roger and Shanks have too, at most they have df power and even awakened powers).
I assume the adv CoC is based on two steps similar ryo, the first one have the power to combinate with their attacks, the second is to manifest his CoC on forms like ashura.