To begin the 2011 season, Michigan's defensive line was nearly non-existent. The foursome of Craig Roh, Mike Martin, Ryan Van Bergen and Will Heininger combined for a paltry two sacks and seven tackles-for-loss in the first four games combined.

The line's tackle stats were equally disturbing. You'd have to pass six Wolverines before finding Van Bergen, who was credited with just 11 tackles.

Michigan was able to get away with these puzzling figures due to the confusing blitzing schemes employed by first-year defensive coordinator Greg Mattison.

There's no question the opening four games of 2012 will provide a much sterner test. Films of Matt...

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