The Dallas Cowboys' transition from Rob Ryan's 3-4 defensive scheme to new coordinator Monte Kiffin's Tampa 2 setup has cost them a talented young defensive lineman. The team has shipped Sean Lissemore to the San Diego Chargers in exchange for a 2015 seventh-round draft pick, reports Todd Archer of ESPNDallas.com. Dallas locked up Lissemore, a high-motor defensive end capable of moonlighting at nose tackle, to a three-year, $6 million contract extension last September. One undisclosed agent opined at the time that setting Lissemore's salary at $2 million annually was a "steal" for the Cowboys. After a promising season in 2011, Lissemore's play dropped off last season, due in large part to a mid-season high ankle sprain. Source: NFL.com