Defensive tackle is a position of concern for the Dallas Cowboys. Their best player is Osa Odighizuw who is in the last year of his rookie contract. They recently made a huge investment in Mazi Smith, but after an underwhelming rookie season, people have slowed their roll on that one. After those two, it gets worse. Veteran Carl Davis, second-year player Viliami Fehoko, and rookie Justin Rogers have a combined 30 defensive snaps between them in Dallas. This position group remains a weakness for the Cowboys' defense, but why is this always an issue year after year?