Except Flynn has proven he can play at a decent to good level when taking over for an injured starter. Weeden looked terrible against the Cardinals and has looked like a rookie in practice.
Flynn did his job and did it well for the Packers in 2013. A couple of the wins he had, one of them against us, were vital for getting them into a playoff spot. Remember when Rodgers returned, that Bears game would have been meaningless if Flynn didn't win a game or two.
That's what Flynn would be brought in for, if Romo goes down for a game or two, we can pull out a win that could come in handy later in the season.