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To me, Michigan's defensive line is the biggest concern on the entire team. That's not good, seeing as it is crucial to at least have an adequate line in order to be a contender.
This line may end up being fine, but the real question is, how long will it take? We'll see just how close they are when they go up against arguably the best offensive line in the country in Alabama.
Will Campbell is the key to this line, as he has the potential to be a Mike Martin-like player. I don't want to say that Mike Martin was taken for granted, but I think fans will now realize just how special of a player he was. He constantly demanded double teams and sometimes even fought through those.
Campbell needs to produce, as there isn't much depth behind him. Michigan's situation at defensive tackle is similar to their situation on the offensive line in that they don't have much depth.
Starting next to Campbell at tackle will be Jibreel Black, who I am cautiously expecting big things from. Craig Roh will be starting at strong-side defensive end. I think he'll play like he has most of his career: solid, but not necessarily great.
Frank Clark and Brennen Beyer will battle to start at weak-side defensive end, but regardless, I think we'll see a lot of both of them. Many feel that Clark may be an absolute monster by season's end, and I'd have to agree with them.
Too many questions surround this unit heading into the season, though. Although Michigan's back seven may be solid, the defense will still struggle if the line gets pushed around. Fortunately, we will find out in Week 1 what this D-line is made of.