What era are we playing in? In the current 2020s, Starr wouldn't even be my 3rd pick. I'd want Rodgers, Favre, ****ey, and then Starr. In that order.
As good as Starr was, and let's be honest, he was pretty damn good, he was physically limited. He couldn't throw a deep out in the modern game. He'd be an interception machine to try.
His greatest strength was his brain. In the modern game with headset radios, would that advantage be eliminated? Did he have the aptitude to handle the constant personnel grouping changes? I don't know this for sure and it's the hardest part about projecting old players to the modern game--it just changed to so much.
(As an aside, that's also my biggest problem with old offensive linemen. Size aside, before the mid 1970s ((I think)), you couldn't use your hands at all. Once the rule change, now hand size, arm length, ability to punch, etc, became a factor. It wouldn't surprise me if half, or more, of the old time greats would be terrible pass protectors in the modern games. Or if they all had to be come guards. )
If we're in a more throwback game, my preference would be Favre, Starr, Rodgers, ****ey, in that order. Favre was the ultimate iron man and would likely hold up in an era with less quarterback protection. Rodgers and ****ey were both more fragile, so I'd move them down the list.