Brady is a guy that will work himself to death if they let him. He needs to be told to 'get lost' for a couple days, and not even think about throwing the ball, or he'll wear out his arm because he knows no other style than to go 110%.
I hope he's not injuried, and I sort of doubt it. But the guy is Type A, and the coaches have to make sure to keep him from overworking. An extra day in camp won't make any difference to him. Getting tendinitus in his elbow from over use will make a difference.