Anyone watching the 'Boys against Nawlins tonight saw how losing a single ILB completely changed the defense. Up to losing Sean Lee, the CBoys were punishing Brees and smacking RBs left and right. After Lee's injury, the CBoys looked like a bunch of inept high-schoolers and the Saints shredded that defense like hot knife in butter.
It was just one guy, but that guy happened to be the one calling the defense and making a lot of the plays. Just proves that the Steelers struggling in the middle might not be scheme, or talent, but simply inexperience playing in the middle.