Yankees get Joe Thurston

[BronXBombers51]

Yankees acquired second baseman Joe Thurston from the Dodgers for a player to be named.
Thurston looked like a long-term regular when he hit .334/.372/.506 for Triple-A Las Vegas as a 22-year-old in 2002, but he's gone backwards every year since and was hitting .288/.326/.412 for Las Vegas this season. That he's outperformed Tony Womack this year doesn't make him a major leaguer. He'll almost surely be assigned to Triple-A Columbus. Jul. 30 - 3:24 am et
Source: dodgers.mlb.com

I remember when this guy was a top prospect. What happened to him?

[blankman]

Um....why??

If the PTBN isn't any good then I'm fine with this, I'm just not sure what the motive is.