QUOTE (ammek @ Sep 28 2009, 11:47 AM)

Favre has never won in Dallas.
Favre has never won on the road against the following teams:
Baltimore Ravens
Dallas Cowboys
Indianapolis Colts
New York Jets
Philadelphia Eagles
Pittsburgh Steelers
He didn't not beat the Bills on the road with the Packers, but did with the Jets.
Also, back to the original topic, are you talking only about quarterbacks, or any position players? If I go back into the Packers late 20's and early 30's as well as the 60's dynasty, I'm sure there are players who beat every team available in the league back then. It would take hours of digging, but considering the 1929, 30, and 31 teams won 3 NFL titles in a row all it would take is one player from the Packers to have beaten everyone, then play for another team that beat the Packers. I don't think anyone has actually done the research to find out if this has happened or not.
Since the league went to 32 teams in 2002, Favre would be the highest profile player to do that if somehow he beats the Packers, but in the history of the NFL, I have not seen any proof that he is the first.