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Take a good defense, add Rex Ryan and you have a great defense. Right? Eh, not so much when it comes to the 2015 Buffalo Bills, a questionable defensive venture from Rex.

The Bills rank 19th in total yards allowed per game, 16th in points and players are apparently "unhappy." Specifically superstar pass rusher Mario Williams who, according to a report from Ian Rapoport of NFL.com, "could be finished" in Buffalo after this season.

One of those players is Mario Williams, who hasn't been shy about voicing his concerns with the scheme this season. Per Rapoport, don't be surprised if Williams doesn't return to Buffalo next season and hits the free agent market. There is a "clear, fundamental disconnect" between Ryan and his defensive line and Williams seems to be at the heart of the trouble.

Surely everyone understands how a Rex Ryan team works at this point. When things are going well, everyone is very happy. When things are going poorly, everyone is unhappy. 

And things aren't going well right now. The Bills have lost three out of their last four games, including last week against Philadelphia in the LeSean McCoy Bowl. The playoffs aren't totally out of the question yet but at 6-7 the Bills are essentially finished. (Football Outsiders gives them a Lloyd Christmas-esque 2.6 percent chance of making it.)

Take a new coach, a huge salary, a defense not ideally fit for Williams and a struggling team and it's not entirely surprising to hear. 

Even at 31 and with a bad season in Buffalo tainting his resume, Williams could cash in again if he hits free agency. Pass rushers are always at a premium in the NFL. 

Mario isn't happy with Rex according to a report. (USATSI)