I'd drop him for LaPorta, who's very quietly putting up decent numbers. He'd be better than running out Ian Desmond in a UTL spot... bleh. You don't need Stewart, and Derrek Lee really isn't Derrek Lee anymore. Your staff is already really good, and while pitching depth is nice, Zimmermann in a 12 team league is borderline FA material at best.
Hanley, CarGo, Crawford, Pedroia, A-Rod Roy Halladay, King Felix, Lincecum, Greinke
I'm pretty sure what ever move you make you have still some how managed to get a roster that looks like its in a 6 team league. Congrats on getting 4 1st rounders and 4 2nd rounders, I personally like Zimmerman this year but it looks like you don't need the pitching (or hitting) but a back-up to Moreland wouldn't hurt since Morales is not coming back anytime soon at 1B.
Larry - "Who's this? Who are you?" Crash Davis - "I'm the player to be named later."