Xander was making really good contact and it made sense to rocket him through the org. The Braves do it for their top prospects.
At the end of 2013, it was really just supposed to be a cup of coffee, but the Sox had a really weak left side of the IF and the issue was forced. Clearly, Xander didn't have a great 2014 and probably could have used a little more seasoning. He only had an 822 OPS in AAA in 60 games. He wasn't banging the door down.
MLB wRC+
2013 85
2014 81
2015 111