Amir looked like he had the highest ceiling of all players, sans Mo (and maybe Harris) last season. He came in mid-year, and rose to the challenge, progressed daily. I do not think it is a gimme that he is beat out for the 3 spot by Sampson next season, not because of baseball. He is one heck of an athlete, maybe the best on the team (tough to gauge and no small order).
I could see a starting five of -for the beginning of the season at least:
Green
DLO
Garret
Sanchez
GG/CO