The Dallas Cowboys are trying their hardest to improve what was the league's worst defense last season as quickly as possible. #Cowboys DC Christian Parker says he doesn't like fans and other people posting videos from training camp practices. When Parker was with other teams, he would find Cowboys practice clips online and flag anything they could use. In fact, Dallas posted six of those on Sunday alone. Over the course of training camp, a dedicated and ambitious assistant could certainly compile dozens and study them, comparing the practice to what actually transpires in preseason.