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Heading into the 2012 season Tommy Hanson was seen as a future top of the rotation starter. He battled injuries during the 2011 season, but when he was healthy he pitched like one of the best pitchers in the game. Then he tweaked his delivery that winter in order to relieve some of the stress on his shoulder.
Hanson wasn't the same pitcher in 2012 as his tweaked delivery didn't generate the same type of pure stuff. That lead to him being hit more than he ever was and pitching more like a back of the rotation starter instead of someone that was projected to pitch at the top of the rotation.
The Braves made this move because they had pitching depth. I am calling this as questionable because we don't know if the Braves knew more than we do about Hanson's health. On the surface it seems like they could have received more than a reliever from the Angels than a power-armed reliever, especially with Craig Kimbrel, Jonny Venters and Eric O'Flaherty already in the bullpen.
The next year or two will see if this was a good move or a really bad move on the Braves part. If Tommy Hanson can regain his 2011 form, the Braves will look bad for not giving him a chance to rebound. However if Tommy Hanson doesn't rebound, getting a pitcher like Jordan Walden in return is a plus.