He easily can become a Yonko if he had a strong crew. Marco literally was a candidate to become one and he is nowhere close to Hawkeye.
I just told you a CoC user who follows a non-CoC user because he was overpowered by him. Strength rules everything my friend.
Doffy and Boa arent World's Strongest, Mihawk is. And how do you actually know that Mihawk doesnt have CoC? Any facts or wishes?