The AL East isn't quite as terrifying as it used to be. That being said Dempster looks like a 4.30 ERA pitcher to me across 3 years - or about a 102 ERA+. If he pitches ~195 IP x 3, and one of the kids makes it into the rotation by mid '14, look for at least one of: Lester, Buchholz, Lackey to be dealt.
To me, Rubby's intro the bigs will be as a RP, not SP.
I am not a con artist! I am a businessman! I have a big brain and I'm good at making deals! People are just jealous of my BIG BRAIN! BAD!
Guess who? The future X-Presdent...