This also allows the G-men a few more options at the draft. Instead of having to pick a LB they can draft Tiki's eventual replacement (Deangelo Williams,Larence Maroney, or LenDale White), a playmaking receiver (Santana's brother Sinorice Moss), a DT (Gabe Watson is a 350 LBer requiring double teaming) or a corner (tremendous depth this year). They won't be able to address OT since Ferguson and Justice will long be gone.
While they have been talking defense for the draft, I think it's a misdirection play and they will indeed take a running back. At least I HOPE they will...