‘While Pettine made some improvements, the defense still has a few weaknesses. The Bills were 28th in rushing yards allowed and 20th in scoring defense. The team could use a boost at linebacker to help defend against the run. And while the Bills have some good young safeties, they could use an upgrade at cornerback. Schwartz will be able to help in some of those areas and build off the Bills’ progress in 2013. During his stint with Tennessee, the Titans defense was a top 10 unit three times.’