It was 2 of Delcarmen, Masterson, and Hansen? I thought it was Masterson + WMP, but I'll check that.
Like Crespo said, I see him more of a late-inning reliever (like a set-up guy) because of the lack of space in the future rotation. With the young arms we already have that project to occupy slots in the rotation in the next 3 years, I don't see Masterson holding one of them. You can also be sure that the Sox will try to sign at least one big-name FA pitcher in that time frame. So, Masterson may be ready sooner than 4 years from now, but I don't see him having a spot on this team until then.