Why is Hamilton playing Center?

I just read that Josh Hamilton got injured in yesterday’s game. The thing that stood out to me in the article was that he is playing center field? I want to know why. Josh Hamilton can play center, but he is not great. The Rangers have many alternatives that are better in center such as Andrew Jones, Marlon Bryd, and David Murphy. Hamilton is their best hitting outfielder, so why not put him in one of the corner’s to preserve him more for his offense when one of the other corner guys are more than capable to play center.