They could take a flier on someone until Bradley is ready.
Andrus is a great SS, but his speed is what counts. I don't know if he would work out for the sox considering they still like to play station to station and wait on the big homer. Having someone in your lineup with not a lot of power, but plenty of speed isn't going to work unless you let them run the bases..
He could bat 8th or 9th for us though, unless we get rid of Ellsbury, then maybe leadoff.