Brett Favre
It’s easy to forget that Favre didn’t start his NFL career in Green Bay because he has such a close association with the franchise. The Falcons drafted him in 1991 but his rookie season didn’t go well. They traded him to the Packers the following year before his career revival.

Incredibly, some of the team’s doctors advised rejecting the trade because of Favre’s medical results. In the end, they took a chance and it was one of the best decisions ever. Favre became one of Green Bay’s most iconic players and helped the franchise to a Super Bowl victory in 1997 (via Fansided).