Rodgers needs to get seasoned a little more and the Packers need to establish their offensive weapons. Nothing worse for a new QB to be unsure of what he's going to be working with for his first couple of years. Favre needs to be there because the Javon situation is up in the air and the offensive line is being reformed.
That being said, I want to see Aaron mixed in a lot during the preseason - if not starting the first two games. If the Packers are getting blown out or are winning by a significant margin, Rodgers should be put in and he should run the offense like it was 0-0. None of this basic handoff shit. He's pretty green in terms of the NFL but quarterbacks that get two years on the bench usually come on strong. This is good for the future of the Pack.