We did just graduate Bello, but your point is still a valid one.
Houck, Crawford, Whitlock and Wink are also recent grads. This group of 5 is better than any 5 I have seen in a very long time.
The next five look very concerning. Like you said, not are even on anyone's honorable mention list.
Mata can't stay healthy and should be converted to a RP'er ASAP.
Wikelman can't improve his BB/9, but does show some promise.
Perales is only 20 but has a ways to go to make anyone's list.
Drohan is dropping like a lead Zeppilin
Walter and Murphy have probably peaked.
We do have quite a few lower ranked pitchers, and maybe 1-2 show marked improvement, soon, but again, I doubt any make a list:
Gambrell, E R-C, Dobbins, Bastardo, Guerrero (RP), Hoppe, Rogers, ICoffey, Troye, Paez, Penrod, Duffy, Uberstine and of course, good ole Noah Song.