He's athletic and aggressive but not spectacularly athletic. It's not like we see him make a bunch of 5 star plays in between the errors.
He has been an inconsistent playmaker since entering the league.
I'm not concerned at all about the bat. He's a preternatural hitter, but he's a third baseman. His tendencies and skills make it possible for him to be an elite defensive third baseman too. Machado or Donaldson skill set, sort of.