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MF: One of the most overlooked pieces of Notre Dame's defense has been nose guard Louis Nix. He is a junior who came in overweight two years ago, dropped roughly 40 pounds, and then was told last year that he might not see 20 snaps a game. Injuries turned him into nearly a full-time starter last year, and he has taken his game to another level this year. His numbers -- five tackles for loss, two sacks and one forced fumble -- simply do not do him justice. He regularly takes on two blockers at a time, freeing up athletic end Stephon Tuitt (12 sacks) and allowing the Irish linebackers to make more plays. The biggest question for me -- especially after the SEC title game -- is how much pressure can these guys get on AJ McCarron? Is this offensive line invincible?