1. Troy Aikman (1989)
One of Dallas’s best-ever quarterbacks, Aikman spent 12 seasons with the franchise. The three-time Super Bowl champion played during one of the Cowboys’ most successful eras. But things didn’t start well for the future Hall of Famer. In fact, his rookie season debut was horrendous. The team tanked and Aikman was winless in his 11 starts (via Sportscasting).
The Saints hammered Dallas 28-0 on his season debut as Aikman discovered the reality of life in the NFL. Things didn’t get easier over the course of the season as the Cowboys only won a single game. Nobody expected him to become the longest-tenured QB in franchise history, but Aikman turned it around. In the end, the hapless rookie became a franchise legend.