Mike Pettine changing defensive culture, plus impact of Tramon Williams

Mike Pettine's arrival in Green Bay fills a leadership vacuum on defense, a role Packers players appear thrilled to see taken in a post-Dom Capers world. The trickle-down affects for this team could be serious. Plus, Tramon Williams isn't the biggest headline offseason move, but the entire development of this defense could hinge on his ability to be a reliable player. 

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