It is not about power level, it is about Oda.
I think Mihawk will be taken out and narration will be: He fought against strong marines for 7 days, the enemies used canons, bullets, fire, etc. Mihawk killed all of them, but he was exhausted and someone stronger came in and finished/captured him.
This is what I am afraid of. I hope Mihawk dont get this treatment and actually show what he is capable of in a 1v1 fight.