No kidding. Giolito has a 70 change. That's not my opinion btw that's Keith Law's. It's so good he doesn't need a breaking ball to dominate lineups most games.
He also hits a ton of ground balls and when he gets it in the air it's an automatic out if not smoked.
I think defensive shifting might get him in the majors as ground ball hits become outs.
It's not, it's based on seeing him do stuff that worked in the minors that won't in the majors. I'm by no means writing him off, but since turning pro I don't think he's been as advertised in any skill other than defense.