Well it's my opinion. The Raiders severely regressed this year. The Bengals regressed this year. The Browns regressed.
I make this point because I think this roster overachieved and normally games we lose (Atlanta, TB, Indy) we happened to win. On pretty lucky plays mind you.
Even throughout the season you could see regression. Our defense stopped getting all the turnovers and we went into a slump. Our offense was abysmal pretty much since the Raiders game.