Cowboys defensive end Taco Charlton was inactive Sunday despite not appearing on the injury report all week. He had been dealing with a shoulder issue that caused him to miss three games.Charlton was a full participant in practice the previous week, but only played four defensive snaps against the New Orleans Saints.Cowboys executive vice president Stephen Jones gave Charlton credit on Monday for playing through the injury, but added that last year's first-round pick needs to "step it up a notch.""All players deal with injuries in any given season and he's just got to work to get better," Jones said on 105.3 The Fan's G-Bag Nation show [KRLD-FM].