I wonder if Peavy made them guarantee 2013. If he did, Peavy will likely give them good production, but simply not enough to make up for his contract (4 years, 70 million through 2013), the players that it took to acquire him, the fact that he's had multiple injuries, his age (late prime to possibly moving slightly out of prime), and the fact that he's moving out of such a pitcher friendly ballpark. It makes a little more sense if 2013 was a club option, but the likelihood is that it won't be a terrible deal for the White Sox, but it certainly won't be a good one either.