It's just an ugly situation from a roster management perspective...
I agree that we need another RB (I'd be happy with 5 healthy scholarship RBs, 4 gives me some heartburn, but 3 scares me).
Then again, I also think we need a QB (more than a RB). King is almost certainly gone, Perry could be gone... And the best teams get at least one every class.
But above and beyond every position, we need more CBs right now. It's crazy that in this modern pass-happy game we seem to always be rolling 5 CBs deep.