Starters, yes. Most of our depth, only at DT. Still have Elam, Benford and White at CB. Poyer, Hamlin, Lewis(in a pinch) and Neal have another year at safety.
We have been playing down 4-5 starters on defense already this year and they have been doing well enough. They can add more in the draft but I would prefer them to add it on the scoring side of the ball. One player on offense can make everyone else better that is already there.
I don't one player on defense is going to make them shut teams out every week.