The Colts cut Anthony "Booger" MacFarland loose today, and the Browns released Orpheus Roye, deepening the DT pool. MacFarland is still just 30 even though it seems like he's been around forever. He obviously has tons of cover 2 experience, and might be a solid sign for the Bills.
Roye isn't a cover 2 guy per-say, but he is a big bodied veteran who can be a space eater. I would prefer MacFarland over Roye, but both would help.