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And coach Chan Gailey has maintained there’s only room for one backup, because the No. 3 job is going to receiver/wildcat specialist Brad Smith.

It is the latest blow to Young’s once-promising career. After leading Texas to the national championship in 2006, Young was selected third overall in the draft by the Tennessee Titans and was the NFL Offensive Rookie of the Year.

The Titans eventually ran out of patience with Young and released him last summer. Young had a disappointing season as Michael Vick’s backup in Philadelphia last year.

Jackson has had an up-and-down career since being selected by Minnesota in the second round of the 2006 draft. He spent five years with the Vikings, including a 2007 when he went 8-4 before losing his starting job.

Jackson signed a two-year contract with the Seahawks last year, and was credited for playing a major role in the team’s turnaround after a 2-6 start. He had career numbers in completions (271), attempts (450), 3,091 yards passing with 14 touchdowns and 13 interceptions.