Sounds like the Hashirama of OP, only relevant at the end, stronger than his friend and rival.
Hashirama wasn't really relevant because his soul was devoured by the Shinigami, at a point in the story where he specifically wasn't designated as the strongest Hokage. The second he comes back to life, Hashirama's presence has Madara jizzing himself.
Mihawk's got free reign to do anything now and Oda really decided to not have Mihawk involved, lore wise, in any event in the manga. Not one.
Idk how that isn't worrisome to you guys. I'm sure he'll have a cool 4 chapter fight with Zoro, but he's only gonna amount to a beefed up Zoro-Opponent at this rate.