There is zero possibility that Weeden sees the field better than Tony Romo.
Maybe not, but he has nothing to lose, so he will let it rip, unlike Romo.
That throw to Dez in the End Zone on the slant(Yeah he dropped it), I think Romo would have hesitated. For good reason, you never know if a lineman will just drop back, but Weeden does not care, which can lead to bigger plays.
Don't take my post the wrong way, I would rather have Romo. Just saying, if he's not 100%, don't start him. He's already a little gunshy(Which is why he holds onto the ball and scrambles around. A good thing by the way). So 2 things can happen with Romo not being 100.
A. The fact he does not just let it rip anymore, and holds onto the ball to create the play. He won't be able to do that at below 100%, so he will take a big sack, and possibly hurt his back more.
B. He goes back to his hold self. The one, where if he's injured, see's a man coming, he says "Screw that" and just throws it up, off of 1 foot, while turning his back to the defender, as if to say "I'm out of here". Then it get's picked, because he can't elude the guy, and does not want to get hit.
So just sit him, and let Weeden get a crack at it.