Ever since we finished the Whitebeard War Saga and entered our flashback, I have been wondering, Where has Mihawk been? But, I've realized, If Mihawk was truly as strong as he has been made out to be, we would have seen more of him.
All the characters who we really hadn't seen previously were revealed in terms of strength during the last arc, for example:
Whitebeard: His power, and other abilities. Almost killed an admiral.
Ace: Fought an admiral, even after rotting in jail, and was bloodied and tortured.
Jimbei: Helped immensely in the escape from Impel Down.
Sengoku: Restrained Garp and revealed his power.
I can continue for hours, but the point stands. If Mihawk is so strong, why did he do pretty much nothing outside of fight some useless swordsman from WB's crew, who he didn't even beat that easily?
My theory: Mihawk is not everything he is being made out to be.