Another way to look at it...

The Vikings game is at Noon, while the Packers and Cowboys/Eagles games are at 3pm. If the Vikings win the early game, the Packers are playing Arizona no matter what. If the Giants win the game, then... if the Packers win, they are playing Arizona no matter what. If the Giants win the early game and the Packers go on to lose, they will play Dallas (if Dallas wins) or they will play Minnesota (if Philly wins).