Bleis has been dealing with injury, so his sample size has not had long enough stretches to make any real determinations on "stagnation," progress or decline.
Arias has always been a great defensive player. He's not "breaking out" on D. People are just watching him more closely, now. Aso, while Greenville might be the "low minors," it's not the "very low" minors, and for a 19 year old, it's actually "very" high.
Cespedes has had injury issues, as well, else he might be at GRE with Arias.
All 3 of these guys have more to prove to make a jump into where our big 3 have been, but IMO, all 3 are young enough and have shown glimpses of top skills to be on the radar of national rankings. Jh Garcia might pass 'em all, and don't count out his brother, either. Justin Gonzalez looks intriguing.
The pitching is much harder and fluid to have any idea of how high any of our pitching prospects might rise. Even if Perales never got hurt, it's hard to know how high he'd be at, right now.
To me, Tolle, Clarke and Valera have some very high upside potential, but I'm not sure how high their floors are. Dobbins and Fitts have more identifiable floors, but their ceiling look limited. Early & Sandlin may be the wild cards.