Whoever the Bills hire as the next defensive coordinator will be the team's fourth in four seasons, a fact not lost on safety Aaron Williams, who tweeted about the high turnover rate Thursday.
This is a crazy business. It'll be my fourth year in the NFL and I've had a new DC every year— Aaron Williams (@ajwilliams23) January 23, 2014
Pettine believes in an aggressive, attacking defense like Ryan does, and this season the Bills allowed the league's lowest completion percentage (55.3 percent) after the Jets had held quarterbacks to 52.6 percent the previous four years.
Buffalo blitzed nearly 40 percent of the time when the opposing quarterback dropped back to pass. Buffalo's run defense, though, struggled, finishing 28th in the league. Even the Browns' woeful rushing offense managed to run on the Bills.
Pettine is direct, forceful and will attack the same way former Browns defensive coordinator Ray Horton did -- with multiple fronts and different personnel groups.
The Browns submitted a request to Buffalo to interview Bills LB coach Jim O'Neil to become Cleveland's defensive coordinator, league sources said. O'Neil and Pettine also worked together with the Jets.
Information from ESPN NFL Insider Adam Schefter was used in this report.