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Stephan Savoia, Associated Press
Buffalo Bills defensive end Marcell Dareus rubs his face late in the fourth quarter after the New England Patriots scored 49 unanswered points to defeat the Bills 49-21 in an NFL football game and secure home-field advantage throughout the AFC playoffs, Sunday, Jan. 1, 2012, in Foxborough, Mass.

ORCHARD PARK, N.Y. — Buffalo Bills general manager Buddy Nix would rather wait a week before providing a detailed assessment on what went wrong this season, and how he intends to fix it.

When it comes to sharing a general thought, Nix says there was "no excuse" for the team's seven-game skid.

After a surprising 5-2 start, the Bills (6-10) closed with a familiar thud by losing eight of nine to miss the playoffs for a 12th straight year.

If that's not enough cause for concern, leading receiver Stevie Johnson further clouded his future in Buffalo.

Eligible to become a free agent, Johnson was benched Sunday following his latest questionable touchdown celebration during a 49-21 loss at New England. Johnson did not make himself available to reporters Monday, when players cleaned out their lockers.