Curious, why do you think Cassel is going to be a good starter? When I see him he is jumpy in the pocket not overly accurate and he does fumbles ALOT. He does not even seem to have that much command in the huddle.
I remember seeing Brady in the pre-season, he had something to get excited about. He hit the open receivers, had that command in the huddle and just seems instantly like a leader. He also had that uncanny pocket pressence and stepped up in the pocket and was extremely accurate.
I guess it is true what the experts say, the backup QB is the most popular guy on the team.