I agree with you K-9 on the LB situation. There was some really bad LB play this past year. This is what we evolved into during the season once Edwards pulled his head out and realized he didn't have the players to play a 2-gap 3-4.
http://www.scardraft.com/Phillips34.html
(Note who is listed as the perfect player for the WDE, btw. )
Williams is fine as the NT in this scheme, but our LBs couldn't control their gaps which was why we were gashed all season in the running game. Kelsay started as a true Sam in Edwards defense and showed he was a total cluster in space and had no ability at all in coverage. He continued to play the contain defender, whether he lined up in a 2 or 3 pt., and was usually embarrassing to watch. He's a lightweight DE, narrow in the waist, and without great hands or superior strength. He can be a "better Maybin than Maybin" and head up field and cause disruption once in a while, but that's not saying anything. He can win his battle once in a while; but, he's simply not a good fit for nor good enough to play this defense. Our primary pass rush should have come from the other side, but the Maybin project flamed out before it left the drawing board. Torbor didn't produce and then went down. Merriman gave a PC and turned up on IR before you could blink. Moats finally got bounced out there and he showed a few good things, but he was still a rookie and not a LB in college. On the inside, more injuries and guys moving around. Davis is a downhill plugger and is terrible in coverage, but he was sent to IR early and Ayodele showed why Miami had dumped both he and Torbor after looking at their run defense problems. Posluszny is a disappointment and I think your earlier criticisms apply to his play very well.
To be even a mediocre defense against the run, the Bills are going to have to find a new set of LBs.