We don't need a new running back though. For the 2011 season, the Bills gave up the 3rd most TD passes in the entire NFL (only Raiders and Vikings were worse), opposing QBs had a 63.3 pct (5th worse), 90.4 rating (7th worse), and we were 14th worse in passing yards. In addition, the Patriots had the #1 passing offense in the AFC. Anyone who wants to win the AFC East will have to shut down their passing attack.
Barron would also help us in run support, where we were 5th worse in yards per game, 5th worse in total yards allowed, and 2nd worse in rushing TDs allowed.
Be it a DB, Kleuchy, or Barron, our 1st pick will be someone that helps shut down the pass. It won't be a LT. Nix has said that people need to listen to him and he has repeatedly said he likes Hairston as a LT.