The Lester deal is interesting. I have had a lot of faith in Lester since he's been around and I still do really. In some ways I see how this trade could be beneficial, largely considering the "pitching" that Boston gets in return. At the same time, the rotation is largely unknown and it seems that Lester still has it in him to turn it around.
At the same time, you keep Buchholz, who certainly has a good chance. This should certainly give some confidence in trading Lester. You continuously here how Buchholz can't continue doing what he's doing. In reality, I recall hearing the same thing about Greg Maddux, Derek Lowe, etc. etc. While not to say that Buchholz or any of the examples given are anywhere near the same level, I think Lowe and Maddux are great examples that you don't need to necessarily be the most intimidating or powerful pitcher in the game to win. For this reason alone Buch is certainly worth believing in.
In my personal opinion, this is one of the tougher decisions that the Red Sox have had in recent memory. While Wil Myers is highly touted and almost as sure a prospect as anyone could acquire, he still hasn't shown anything yet. Lester has. At the same time, Lester hasn't show that he can bounce back from what has happened recently either.
This certainly wouldn't be a positive move for the rotation either at a glance, but could allow a little bit more free money on the pay roll. I can see this move being a positive, assuming that whatever pitchers the Red Sox do pick up (be it through trades or free agency) are good, and assuming that the Red Sox will be able to use a tiny bit of that money saved from Lester (granted it's only...ha...only 10 million or so) to make good improvements either this year or next year. As I said above, it's a tough decision for me personally and I'm really torn either way. I guess since I grew up strongly believing pitching wins, and now believing that Lester can pitch in the future, I lean slightly toward keeping Lester, even if it seems like I completely argued against that after reading my post. It's always fun to argue with yourself.