John Huarte
During his time at Notre Dame, John Huarte only had a single good season. He became the starting QB of the Fighting Irish in his senior year and won nearly all games in the 1964 season. After his Heisman season, he was drafted by the two pro football leagues at the time. He chose to sign with the New York Jets of the AFL instead of the NFL’s Philadelphia Eagles. Sadly, Joe Namath beat him out of the starting spot. This was the reason Huarte was simply the backup QB from 1966 to 1972.
Ty Detmer
In 1990, Ty Detmer served us one of the best seasons of any QB in college football history. The BYU grad threw for 5,188 passing yards and made 41 touchdowns in 12 games. While his junior year was spectacular, many analysts found him too small for the big leagues. The Green Bay Packers drafted him in the ninth round. He went on to be a backup for Brett Favre. He played for four other teams after this.