Yeah, I agree with that. A lot of the guys we're talking about are like 20/21 and reached Double-A (besides Montgomery). At least the Red Sox and Phillies guys anyway.
I know Montgomery was drafted last year but was he injured? I see no stats for him.
Edit:
Aidan Miller, 20 years old, reached AA last season
Justin Crawford: turns 21 next month, reached AA last season
Marcelo Mayer: turns 22 in 3 days, reached AA last season
Kristian Campbell: 22, reached AAA last season