All of this QB talk is overdone and fails to recognize what all of the championship QB's had in common was one thing, defense.
Take Starr, Bradshaw, Staubach, Montana, Elway, Young, Aikman, Brady, Brees, both Mannings, McMahon, Johnson and Dilfer, what did they all have in common? Great defenses.
Why do you think Brady picked TB? Because he understands that a QB's best friend is not the run game, it is the defense. Same reason Manning picked DEN.
But what gets all the hype? The QB's. The Cowboys had the triplets and the #1 D. The Ram had the greatest show or turf and the #1 D. It was the dismantling of that Rams D that prevented a repeat. Brees and Rodgers don't even have one ring without their D, same goes for Favre.
If the Cowboys want to help their QB, fix the D because he didn't lose that playoff game or the other ones that Prescott QB'd.