Unless you hibernated during the offseason, you know the Ravens lost several major defensive contributors. Bernard Pollard, their leading tackler in 2012, is gone. So is Paul Kruger, their most productive pass rusher. Cary Williams and Ed Reed, who tied for the team lead in interceptions, are too. And then there is that Ray Lewis guy. The Ravens lost a staggering amount of their 2012 production: 59.3 percent of their total defensive plays, according to Football Outsiders. That includes 53.4 percent of their stops, 55.8 percent of their defeats, 52.7 percent of their sacks, and a 76.9 percent of their interceptions. Still, despite all that turnover, there is reason to believe their defense will be better in 2013.