Note that most of the pitchers on the 40-man are now with the Rays: Dane De La Rosa, Brandon Gomes, Chris Archer, and Cesar Ramos. The two who are not had very different ends of the season. Josh Lueke's last six appearances were pretty awful (7 1/3 innings, 13 ER). Alexander Torres, who comes off as the Bulls' very worst pitcher in just about every category this year, pitched a decent few innings in his last game on September 1st.
Youngsters Adam Liberatore and Frank De Los Santos arrived near the end of the year, and looked pretty good.
Looking at FIP, things sort out a bit differently. I wish I were more confident in FIP as a measure of minor leaguers. For the stats folks out there, I used a constant of +3.2 in the computation.
Matt Torra, Lance Pendleton, Chris Archer, and Jim Paduch were the workhorses this year.
Pitching Efficiency is my name for a slightly quirky metric, pitches per out. Look at how hard Torres was working this year.