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Auburn LB Kris Frost
Defense was a sore spot for the Auburn Tigers last year, particularly in the secondary, where they finished 13th in the conference in pass defense (257.7 yards per game). Departures of two starters in that secondary leave major holes, but that battle likely won't be settled until this summer when the Tigers get a talent injection from the 2014 recruiting class.
If head coach Gus Malzahn has his way, the battle at the two linebacker spots in defensive coordinator Ellis Johnson's 4-2-5 defense won't last as long.
Middle linebacker Kris Frost battled consistency and recently departed starter Jake Holland for playing time throughout the 2013 season, but had a breakout performance in the BCS National Championship Game, with seven tackles. Auburn needs Frost to build on that performance and become consistent, because it will go a long way towards solidifying the Auburn defense as a whole.
If he doesn't show the consistency needed to be a star, the staff could do some mixing and matching.
Starting "Will" linebacker Cassanova McKinzy is certainly athletic and big enough to move to the "Mike" spot, and Anthony Swain and Kenny Flowers could certainly jump into the mix for a starting spot with solid spring performances.
Malzahn needs his two linebacker spots settled, particularly the "Mike" spot, currently occupied by Frost, heading into fall camp. If it is, the rest of the defense will be better off knowing who the quarterback of that unit will be.