It seems to me like he will be only for depth and will not see any, if much, playing time before being sent back down once Drew is back. Assuming Pedroia can't play tomorrow (I'm not sure if that's correct), we have 0 backup infielders, so it makes sense. But once Drew and Pedroia come back, Cecchini will have to be sent down, and something will be done with Herrera (since Holt is playing great and we can't have five people for 2B/3B/SS). Then Middlebrooks will come back and something will have to be done with him as well - I would assume minors or trade unless Holt starts really slumping. The Sox seem to like Holt a lot and I can't imagine he'd be sent down with the way he's playing.