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Michigan football's defensive line has serious work to do

Michigan football coach Jim Harbaugh speaks at the National Football Foundation’s Dream Team banquet in Dearborn on Thursday, Dec. 20, 2018.

(Note: This is Part 6 of a series reviewing Michigan’s 2018 position groups and looking ahead to 2019).

When Greg Mattison packed up his office and moved three hours south to Columbus, Ohio, he did more than stun most Michigan supporters.

He ended an era.

Michigan football has had a decade littered with disappointment and surprises. There've been teams playing well above their head, teams falling short of expectations and teams falling everywhere in between.