The Cowboys victory over the Giants simultaneously put them in first place in the NFC East, and robbed them of their most important player. Dak Prescott was the straw that stirred the drink for the Cowboys, and now he’ll miss the rest of the season. Since this is football, they don’t cancel any games because of injury so the Cowboys will have to soldier on.
That process actually started in-game when Andy Dalton had to come on and play quarterback starting around the six-minute mark of the third quarter with the Cowboys leading 24-23 and driving at the Giants 18-yard line.