I think the reason is to get a look at Rojas in AAA. At some point, I think you'll see the switch with Negron the utility guy and Rojas at SS every day. Rojas has the best glove of all these MI guys. If Cozart goes down, he just may be the guy they want up there making the plays every day if Gregorious isn't ready yet. Of course, emegency glove who can handle SS is a job description practically made for Paul Janish, so maybe he's all they need, but Rojas might fit that bill as well. Castro pobably never plays in the big leagues.