I know you are Theo's Assistant and all, but why do you keep pushing this point as if its an obvious fact. The fact is that IF Florida were to try to deal with the Red Sox and IF the Sox wanted to deal with Florida, then Boston would probably NOT set its offer as 3-4 tremendous prospects to get it done, but would start with Lester plus one or two middle tier guys, and possibly work up to two top prospects, but they wouldn't go higher than that and if florida wanted Lester bad enough, they would take it. They clearly wanted Hanley and Anibel; perhaps they want Lester that badly.
The sox know what Lester is worth, and so do many other teams. He was the unnamed pitcher in the A-rod/Manny deal for crying out loud, and that was 3 seasons ago.
Nobody thought the sox would land Beckett for three prospects, except for the Sox and the Marlins FO. The marlins would want good players they can afford, not proven mlb talent necessarily.