This is not asking how good of a defense you WANT here in Chicago, but rather, how good of a defense do we NEED to win a Super Bowl? We've gone from being focused on defense under Lovie Smith, to a focus on offense under Marc Trestman. Lovie never could figure out the other side of the ball. Obviously Trestman's team is D.O.A. until he figures out how to build a defense. But just how good of a defense do we need?