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In terms of players returning, the offensive and defensive lines hold what might be the biggest question marks for Nebraska’s roster in 2014.
On offense, Nebraska will be graduating both starting tackles (Brent Qvale and Jeremiah Sirles), a starting center (Cole Pensick) and one starting guard (Andrew Rodriguez). While the injuries this season have helped to build depth, Nebraska will be starting next season with an offensive line that has a lot of new faces, and it will need to build chemistry quickly for NU (who will be starting, at best, a sophomore quarterback) to succeed.
On defense, Nebraska loses a defensive tackle (Thad Randle) and a defensive end (Jason Ankrah) to graduation. While there were certainly areas to be excited about by younger players like Randy Gregory and Vincent Valentine, there will still be some plugging of holes on the defensive line due to graduation. That attrition is one reason why junior college signings like Terrell Clinkscales and Joe Keels will need to provide some instant impact.
Having potential is great, of course. But until you see potential translate into performance on the field, the area still has to be one of concern.