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Buffalo's defense was down-right laughable last season. It could not stop anyone from running the football. Things have changed, though.
Buffalo upgraded at inside linebacker by adding Nick Barnett and Kirk Morrison to line up with Andra Davis inside. Inside linebacker was a huge problem for Buffalo last season, but with the upgrades it has made, the position has become one of their strengths.
Kyle Williams is the Bills' best player. He is unblockable and arguably the best nose tackle in the NFL. Line him up next to third overall pick Marcell Dareus, and you have yourself a pretty scary defensive line. Do not sleep on Dwan Edwards, either—he is a good player.
The Bills secondary is always solid. They have a ton of talent at safety but need more consistent play from their cornerbacks.
The Bills defense is so improved a top 10 overall defense is not out of the question.