Brock Purdy just might be the story of the year in the NFL. Since being forced into action, he has looked great due to Jimmy G and Trey Lance both going down with injuries. The kid is undefeated as a starter for the 49ers. The Dallas Cowboys defense will pose the stiffest test he has faced but nothing has phased him yet. The 49ers up the ante with their defense whish the best in the NFL. The 49ers rniing game will be the difference. The Cowboys are not good against the run and the 49ers will exploit that and cover -4.