There is one thing about Brady that I have noticed that goes on quite a bit, more this season than in previous - Brady's frustration level when he is indeed pressured, sacked, or just plain hit after releasing the ball.
The "pretty boy" Brady knows his Patriots are the elite favorites this year, and his on-the-field persona and body language wreaks of an "I'm better than you" - cockiness. I noticed a play Monday night when a Bengals defender pressured Brady to the ground. Brady got up extremely upset and the look on his face was priceless. It was like, "How did this guy actually touch me, much less, knock me to the ground?"
Brady looked infuriated.
That is what it's going to take. The Cowboys must pressure Brady, and constistanly be in his face and taking him down to the ground. Brady is a really good QB, but is also prone to making bad throws when pressured. And it's noticeable. Give Brady time, and it's like taking candy from a baby, he'll make you pay.