The departures of LB Bart Scott, coordinator Rex Ryan and S Jim Leonhard will challenge the Baltimore Ravens defense. After dominating the NFL for the past decade, the Ravens' defense enters the 2009 season squarely at a crossroads with a new defensive coordinator set to take the controls. Greg Mattison replaces Rex Ryan as the architect of the league's most feared defense, and he inherits a group that led the league in takeaways on the way to finishing second in yards allowed in 2008.
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