The Big 12 is known for its quarterback play, but not every five-star recruit meets his potential.
Not every two or three-star is a diamond in the rough.
Sometimes, careers require a restart.
The most prominent case this weekend? Former Texas quarterback Garrett Gilbert, who left high school as the nation's No. 2 quarterback and No. 11 overall prospect.
Gilbert showed limitless promise when he was rushed into duty against Alabama for the Longhorns in the national title game to close the 2009 season. Colt McCoy suffered a shoulder injury on the opening drive, and the rest of the game was Gilbert's.
After struggling early, he hit Jordan Shipley for a pair of scores, and looked the part of McCoy's heir apparent in 2010, despite struggling with turnovers against the Tide. (What redshirt freshman wouldn't?)
He never fixed it. Gilbert threw 17 interceptions a year later as the Horns fell to 5-7, and he was benched in the second game of 2011. He never saw the field again, transferring to SMU after rushing to complete 27 hours at Texas.
That allowed him to graduate and play immediately for June Jones at SMU, where he'll get a shot against more Big 12 competition on Sunday when the Mustangs travel to Waco to face Baylor.
"That says a lot about how badly he wants to be here and what kind of person he is," Jones told reporters this offseason.
He's not the only former Big 12 quarterback getting shot against Big 12 competition in Week 1.
Cody Green signed with Nebraska in 2009 after visiting Lincoln and only Lincoln, despite interest from other major programs.
He earned playing time in 2010 and 2011, but transferred to Tulsa in July 2011 after it became clear Taylor Martinez was Nebraska's future at quarterback.
Green threw for 657 yards and five touchdowns in two seasons for the Huskers, but he's found a new home with the Golden Hurricane, who travel to Iowa State on Saturday.
After redshirting in 2011, Green is the new starter for Bill Blankenship's team.
He's already beaten Iowa State once. In 2010, he completed 7-of-12 passes for 79 yards in a 31-30 overtime win to deny Iowa State an upset win and keep Nebraska in the driver's seat for its eventual Big 12 North title.
Green's squad is once again the favorite, and a Tulsa team that has won 10 games in three of the past five seasons could make more noise with the former Husker at the helm. A win against Iowa State would be the perfect start to a season, and the Golden Hurricane were picked to finish second in the C-USA West division.
Former Missouri quarterback Ashton Glaser, who transferred to Missouri State, could jockey for time on Saturday against Kansas State. Because the Bears are an FCS program, Glaser is immediately eligible.
Glaser appeared in just one game for the Tigers over his three years in Columbia, but the Wildcats will be a familiar opponent across the sidelines in his first game at his new home.
For Gilbert and Green, the same is true.