Having just lost Victor Martinez for the year, the Tigers need someone to slot into the DH role. They're looking to go all the way to the World Series this year, but the Victor injury has kind of thrown a wrench in the works. That's why the Red Sox can make a deal for pitcher Max Scherzer and AA pitcher Drew Smyly... in exchange for Carl Crawford, Felix Doubront and $54 million dollars, paid over the next six seasons in installments of 9 million dollars per season.
Receiving Carl Crawford allows the Tigers to move their LF, Delmon Young to the DH role for the year. Delmon is not a good defender, and in a park like Comerica, that doesn't work too well. Crawford's supposedly elite defense plays well in the large Detroit ballpark, and if he bounces back, they get a #2 hitter to hit behind Austin Jackson and in front of Miguel Cabrera.
In return we get a pitcher to put behind Clay Buccholz, a AA pitcher with upside to produce when Beckett and Lackey's contracts are done, and the salary relief we need to fix our team in the long term, or sign Ellsbury to a long-term deal if he repeats his 2011 numbers. Having to give up on Crawford so soon kind of sucks, but he is not the right type of player for Fenway Park, and the Sox should deal him while he's still considered a possible MVP candidate, instead of a a big-contract bust.