I agree Pomeranz has been remarkably good lately--basically since he made a scene after being taken out after 4 innings.
My concern remains, however, that he basically has just 2 pitches, knuckle curve and fast ball, which means he really has to have control.
Based on repertoire--at least three good pitches--and control, I think the rankings should be Sale, Price, ERod, Pom, and Porcello.
The bigger point, however, is that, when ERod returns, that's a pretty good rotation, especially if Pom can stay at this new level and if Porcello can somehow get his command back.
I agree with all the compliments for the bullpen and with moonslav's interesting stats.