It's Football 101. The Cardinals were set on taking away the run by stacking 8 and 9 in the box. They had zero repercussions for doing so because Weeden could not beat them with his arm when stacking 8-9 in the box is a favorable position for the passing game to be in.
That is it exactly. Any defense can bring up 8 or 9 guys in the box and stop a team from running the ball, no matter how good it is. The key for the offense is making the defense pay dearly in the passing game when they bring that many up against the run.
Weeden was incapable of making them regret bringing so many up. Romo, who is used to playing with no run game to speak of, eats that kind of defense for lunch. He's been doing it all year long. Bring up a lot of guys to shut Murray down and Romo goes right over the top of you. Back up to stop Tony's passing, and Murray will punch you in the mouth.
It's a catch 22 that has made our offense go all season. Weeden completely shot that to hell, and Arizona had an easy time of it. Then, with the Dallas offense unable to keep possession of the ball, the defense (who started out playing well) started wearing down.
As long as Romo is back, we will be ok. With Weeden though... Defenses will shut down the run game, time of possession will go haywire, and the defense will tire and eventually fall apart.
Here is to Romo staying healthy.