Urias was at least as good at A+ last year, at age 17, as Giolito is this year, at age 20. And Urias then continued doing exactly what he's been doing at AA to start the year.
Urias may sit 92-93 most of the time with his fastball, but he can get it to 94-96 when he wants. And again, he's 18. He's in AA and still has projectability left in his arm. That's crazy. There's a decent chance he ends up with three plus pitches with great feel for pitching. That's extremely rare.
The fact that he can still improve his command, while doing what he's doing at the age he's doing it, is crazy. I just don't see how anyone can not have him as the #1 prospect in baseball right now and certainly not the #1 pitcher.
Your first sentence is wrong. Giolito has 11.3 k/9, 2.4 bb/9, and 0 homeruns on the year. Urias was a 11.2k/9, 3.8 bb/9, and 0.4 hr/9
Obviously Urias is a stud prospect, but the reason they have him lower is they projected a lower ceiling for him.
Future Grades:
Gio
FB-75
CB-80
CH-55
Urias:
FB-70
CB-65
CH-65