Switching DeMarcus Ware to defensive end will be the easiest part of Monte Kiffin's attempt to transition the Dallas Cowboys' 3-4 personnel to a 4-3 defense.
Kiffin's 4-3 'under' front will use Ware in a similar way to how he has played most of his career. He will still act as the focal point of the Cowboys' pass rush, by providing pressure from the edge. He will still be aligned wide and on the openside of the formation, away from a tight end. If anything, Ware could have even more pass-rush opportunities playing for Kiffin, than he did operating in a 3-4. That has to be scary thought for the Cowboys' opponents in 2013.
Taking a closer at the switch, a useful comparison is how Ware played under Wade Phillips from 2007-10. When Phillips took over, he altered the 3-4 scheme of previous head coach, Bill Parcells. Under Parcells, the Cowboys operated a traditional, 2-gap 3-4 front. While Ware was still the scheme's main pass-rusher, Parcells' system demanded more coverage responsibilities and extra reads on the outside.