When the White Sox acquired Edwin Jackson from Arizona in 2010, it was widely assumed they were going to flip the erratic starter to Washington for Adam Dunn, who would've shored up the team's lineup in the face of poor production from Mark Kotsay as the team's designated hitter.
That narrative may or may not have been accurate, along with the rumors the Nationals all of a sudden asked for Dayan Viciedo and Tyler Flowers along with Jackson in a deal for Dunn. Of course, the Sox balked at that price, and Jackson remained with the White Sox -- where he was very successful, for the record.
In the offseason of 2011, the White Sox ended up getting Dunn anyway. And now, a year later, the Nationals have ended up with Jackson. And the White Sox still have Viciedo and Flowers, both of whom will be on the major-league roster in 2012.
For the Nationals, landing Jackson is a fantastic acquisition. Since joining the White Sox, Jackson has appeared to harness his potential, racking up 6.5 WAR in 217 23 innings between Chicago and St. Louis. Jackson will fit in nicely with Stephen Strasburg, Gio Gonzalez and Jordan Zimmermann in a Washington rotation that's looking very competitive.