Joe Mays has updated the 3 year Draft Success table to include roster cutdowns that have taken place after training camp.
http://www.drafttek.com/ConsolidatedNFLDraft-stillwithteam.ASP
The Bills' draft success rate is 73.1%, the percentage of players drafted 2009-present that are still with the team. Atlanta is #1 with 95.2% (only the 2009 5th rounder, William Middleton CB from Furman is gone). Worst is Denver.
Other AFC East teams:
Miami---69.6%
NJets---92.3% (Scotty McKnight)
NEPats--66.7%
Astro