When somebody who would rather just live quietly with his family and not bother anybody has decided you need to die, you're gonna have a bad day.nothing is more terrifying than a guy walking closer to you with a calm expression with the intent to transfer you to the after life.
most of us are basically adventurers who would exile strongest member of the groupWe really didn't need multiple chapters explaining how Mirio was actually strong.
They gave us enough hints throughout the story, including the part of Soil having to constantly fight all the monsters of the kingdom.