Courtney Cronin ESPN Staff Writer
The last player Mike Zimmer can remember being viewed as much of a game changer for an entire defense as Khalil Mack was Reggie White when he went from Philly to Green Bay. "They were a pretty darn good defense a year ago," Zimmer said. "Adding a guy like (Mack) is going to be a big factor in getting them better. I think it allows them to play the style of defense that they would like to play."