Valentin should start at 2B at Lehigh, Kingery at Reading. Kingery didn't earn a promotion last year, so why rush him?
Williams - Quinn - Cozens, with Goeddel getting starts against some LH and some time at 3B (makes him more valuable if he can sub at 3B).
Perkins should be traded or released if he doesn't make the ML team.
Pullin is probably headed back to AA where he'll prove last season wasn't a fluke and be the first promotion to Lehigh.
There is no need to rush young players, it starts the clock ticking, so why do so when they're still learning?
In AAA ball they'll see plenty of junk, and that's the key to being ready in the majors, recognizing and hitting (or laying off) off speed pitches.
And fielding reps are the same at AAA or the majors.
Altherr is a better fielder in RF than Quinn, where his instincts are more valuable than pure speed.
Quinn should eventually be the better CF as he gets experience.
Altherr will not be blocked by Kendrick, if Kendrick doesn't hit, he'll get acquainted with the bench, if he does hit, he'll be prime July trade bait.
If Altherr hits, he work his way into a starting job because of his plus fielding skills.
There's just no rush this year, come next season the veterans will be gone and the kids will be competing with each other.
Knapp - Stassi - Blanco - Altherr - Coughlan/Nava will be the bench.