The Bills signed defensive end Mario Addison to a three-year, $30 million deal last offseason, and defensive tackles Quinton Jefferson and Vernon Butler to two-year deals worth $13.5 million and $15 million, respectively. They also drafted defensive end AJ Epenesa in the second round and hired defensive line coaches Jacques Cesaire and Eric Washington. Toward the latter part of the season, the defensive line's level of play rose with Buffalo's entire defense. However, with several additions and defensive tackle Star Lotulelei opting out, there was no avoiding its lull at the beginning of the ...