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Last season, the only upperclassmen on the depth chart were the starting tackles, Taylor Lewan and Michael Schofield. Both were seniors and are now gone, and that's a major problem considering how bad the line was in 2013.
With Lewan, a first-round NFL draft pick, this line couldn't do anything to help produce a run game. Michigan finished the year 11th in the Big Ten in rushing, averaging 125.7 yards per game and besting only Purdue's dismal rush game.
The pass protection wasn't much better, finishing 11th with 36 sacks allowed—again just besting Purdue (39) at the bottom of the barrel.
If anything good came from the disaster of 2013, it's that plenty of linemen got playing time and saw firsthand what not to do.
Names like Kyle Kalis, Erick Magnuson, Graham Glasgow and Kyle Bosch all got massive experience as freshmen or sophomores last year. Clearly it wasn't pretty at all, but if that group can't put it together in the spring, there is a group that will look to take playing time away from them.
Mason Cole, a 247Sports' 4-star guard, is an early enrollee who is likely to challenge for playing time this spring.
The starting roles up front are far from defined thanks to the lack of production from the group last year, so spring must be about finding the right mix of players along the line to be successful.
If Michigan is going to go anywhere in 2014, it all starts up front.