Bart Starr
Johnny Unitas
Phil Simms
John Elway
You answered your own point.
So lets review. Starr and Unitas did win.. we just didn't have a superbowl.. but they won the highest title available to them.
Elway had won to conference championships. Simms was a late starter.. and won the SB in his 7th season as QB.
By any measure.. any at all. Dak would make history if he had success now.
Literally in terms of age, games, time at one franchise.. just every single metric.. history shows that if you haven't got to a championship game at least.. you ain't a winner.