DeMarvion Overshown's penalty raises question of whether Cowboys have discipline problem

FRISCO, Texas (AP) — DeMarvion Overshown said he didn't know inactive players in street clothes couldn't run on the field to celebrate before committing the 14th and final penalty by the Dallas Cowboys last weekend.Whether the linebacker nursing hamstring and back injuries should have known — and whether it's emblematic of a discipline problem under Brian Schottenheimer and his staff — went unanswered by the second-year coach.The Cowboys got a game-winning drive from Dak Prescott to beat the Indianapolis Colts 27-23 despite all kinds of mistakes, but the reality is Dallas (4-5) is either finding ways to lose, or making things much harder than necessary with rampant miscues, heading into a meeting with NFC-leading San Francisco (7-1) on Sunday.The image of Overshown chasing down his celebrating defensive teammates after a fumble recovery was startling. Then there was referee Clay Martin's explanation of the unsportsmanlike conduct penalty: “We had a nonuniformed player in blue sweats an