Webster is going to start 2013 in AA most likely, with a mid season call up to AAA and potential for the rotation in 2014.
De La Rosa will either be a late inning reliever or a starter in 2013, but will be with the rotation.
Barnes will likely start 2013 in AA, and potentially could be in AAA by the end of the season, depending on how he performs in Portland. He's a guy who will likely be up to Boston in mid-2014.
That's 3 middle to top of the rotation starters right there who should be in the rotation within the next 1.5 seasons. I can't remember the last time the Red Sox had pitching prospects like this. Maybe when they had Lester and Buch, but they never had that 3rd piece like they have now. And that's not even discussing Owens, who many believe is the top SP in the Sox rotation.
In terms of trading for Lee, I don't think they'd have to give up Doubront + a B, because the Sox will be absorbing about 95% of the salary.
I would be shocked if Doubront was with the Red Sox in 2013, though.
The more I think about it, I also think the Sox will go into 2013 by acquiring an ace such as Lee or Lincecum, and going Lee/Lincecum - Buchholz - Lester - De La Rosa - Lackey.
I know a lot of people want to go get 2 pitchers, but when you've got an ace in the making in De La Rosa, you've got to give him a chance to show what he can do. He'll be 24 next season, that's time to get him in the game. You don't wait for a guy with that quality of an arm to be 25 before you call him up.