What happened to the OL in particular between 08 and 09 in Buffalo under Jauron and Brandon's watch was odd to say the least. It was almost as if people were trying to fail so as to get fired -- and they were. The Bills went from a line of Peters, Dockery, Preston, Butler, Walker to a line of Bell, Levitre ®, Hangartner, Wood ®, Chambers. There wasn't a single position of continuity in the entire offensive line. That's incredible. In 2012, Glenn, Urbik and Pears (IR) do seem to be upgrades, if not exactly all examples of Buddy building via the draft. The drafts for OL includes: Wang, Calloway, Hairston (IR), Jasper, Glenn, Sanders (IR), and Asper.
On defense, the Bills had Kelsay, Stroud, Williams, Schobel in 09. That's a pretty good group actually with 3 former Pro Bowlers. In 12, the Bills DL is Williams, Dareus, Williams, and X. One hold-over from Jauron, one 3rd pick overall, one high-priced free agent, and a revolving door of bodies. It's not that clear cut, and this unit was really awful with the switch to the Miami scheme out of the gate. The draft for DL includes: Troup (IR), Carrington, Batten, and Dareus.
By the way, with 3 tackles, the top reserve guard, and the backup center all on IR, the Bills face a tough month as they try to win out to make the playoffs. The latest batch of street free agents, Scott, Snow, Welch, Williams, and Young, will continue to get some playing time.