White Sox Wisdom?

Ken Williams, the White Sox GM, put together a rotation last year that had the most impressive starting pitching run in the postseason in the last 30 years, with Contreras, Garcia, Buehrle, and Garland throwing all but 2/3 of an inning in the entire series against the Angels, and following it up with an excellent Series as well. Based on that, why would he trade El Duque, a great 5th starter and clutch pitcher extraordinaire, for another starter, Javier Vazquez. They also had to give up a reliever and an outfield prospect to get Vazquez. From the outside, this looks like a bad move in which he is tinkering with a good thing (ask Theo Epstein how that works out!) and does not get back much of an advantage in return. He also traded a gold glove center fielder for an aging, broken down Jim Thome to DH for him, another questionable move, especially since he made the Phillies GM look good with that one. But Williams made every right move last year, so he deserves the benefit of the doubt...for now.