Review Detail of Mirio_kun in One Piece: The Strange Talent of Cedric Strode

I like the story but there are things I don't understand. Why is measuring himself with normal human from earth when he is in one piece. Not only that his strength growth is so slow that it doesn't feel like one piece world. The reasons for nerfing Mc would have been more acceptable if not for the fact Mc knows ways to grow stronger very fast because of ine piece knowledge. Six styles. Life return is a big cheat. Then there's haki.