Injuries included, we still have quite a few DBs on the roster who have quality playing time experience. L.Alexander with starting experience, Josh Kalu with starting experience, Cockrell with starting experience, K. Williams with quality playing time. Assuming the injuries to Davie, Jackson, and Gerry are severe, players like Trai Mosley and A. Williams have been promising in camp. I still haven't mentioned J. Rose or the two highly touted true freshmen A. Anderson and E. Lee.
So unless the staff is expecting departures other than Boaz Joseph, I'm not sure about the need for a Juco DB.