‘But as the Bills proved over the last two seasons, they have a wealth of defensive talent capable of playing in a variety of different schemes. While Schwartz gets credit for improving the run defense in 2014, the Bills also added a star rookie linebacker in Preston Brown and a proven run-stopping linebacker in Brandon Spikes. Schwartz’s defense was atop the league in sacks, but how tough is it to figure out ways to get pressure on the quarterback when you have three Pro Bowl defensive linemen?’