for this entire team, is what I affectionately refer to as an ass-kicker. (I think I called it that, because most of the Steelers tempo-setters happened to be LBs who would take your head off like Lambert, Lloyd, Porter, Harrison). Call it what you want: a tempo-setter, a guy who operates on a different wavelength than everyone else. It especially came to mind, watching Sherman rip Crabtree the last couple days.
Every great defense has one... at least one guy who plays on an emotional edge. He doesn't have to be the defense's best player, but he sets the tempo, the attitude of the defense. Currently, we glaringly lack that player. (Polamalu is/was that type of player, but his time has passed.) It is something that we should keep in mind, as we debate about guys like Nix, Dennard, Mack, Justin Gilbert, etc. We need a guy who has a permanent 2x4 (not a chip) on his shoulder, an oft-times irrational nut, who drives the defense.