400 points scored should have been enough for the playoffs. Doesn't matter how they are scored. Very low turnovers by the offense, not enough turnovers by the defense. For example, Oakland's defense overall was not very good, but they had 30 turnovers. The Bills had only 18, and they still finished plus six due to the offense not turning the ball over.
And one could say that injuries and poor coaching hurt the defense in 2016, which is true, but injuries decimated the WR group in 2016 also. This team needs better game day coaching and has to stay healthy, esp with bad depth this season. A Boldin or a Barnidge could make a big difference.