it makes perfect sense to me, last year they had no infield depth, so this year they are trying to develop there best hitters into middle infielders. With Arcia/Benson/Morales/Hicks all expected to be in AA or the majors this year they are trying to develop the proficient hitters into a spot where they can use them in the future. The future outfielders arectually look good, so there is no point at developing rosario as an outfielder, and being forced to make a decision to trade him in the near future if those guys reach there maximum potentials, which is pretty high.