The discrete components that mix and mash together to form football teams change each and every season. Players graduate. Offensive and defensive philosophies are tweaked. Injuries throw a monkey wrench into your most foolproof schematic plans. Northwestern keeps intact much of the core that won 10 games last season, but there are new roles and responsibilities – adapted specifically to accentuate players' biggest strengths – littered about this year's roster. The revisions and alterations made on last season's team will foist new challenges on the Wildcats' 2013 season.