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Matt Flynn won't be the first Green Bay backup to leave and start for another franchise. Green Bay seems to be a breeding ground for successful backups-turned-starters.
To avoid having every other person on this list a former Packer, I decided to lump a majority of them into one entry and place them at #4 on my list.
Matt Hasselbeck may be the most successful of the backups. He played two seasons with Green Bay before he was acquired by former Packers coach Mike Holmgren to accompany him with the Seattle Seahawks.
At first, Hasselbeck battled Trent Dilfer for the quarterback job, but Hasselbeck eventually won out. He'd go on to be a three-time Pro Bowler, lead the Seahawks to a Super Bowl and set franchise records for the Seattle team.
He would throw for 174 touchdowns to 128 interceptions and over 29,000 yards with the Seahawks. He led the team to the playoffs six times over his 10-year career with them.
Aaron Brooks was on the Green Bay squad in 1999 behind Hasselbeck and Brett Favre. The next year he went to New Orleans and would take over after Jeff Blake got injured late in the season. He would hold the job until 2005.
With New Orleans, he threw for 120 touchdowns and for over 19,000 yards.
Brooks signed with Oakland for the 2006 season, but never made as big of an impact as he did with the Saints.
Lastly, Mark Brunell was a fifth-round pick by Green Bay in the 1993 NFL Draft. He wouldn't do anything of note with the franchise and was traded to the upstart Jacksonville Jaguars in 1995 for a third and fifth-round pick.
Brunell led the team to four playoff appearances and compiled a record of 63-54 with the Jaguars. Brunell still holds many of the team's career passing records including yards, with 25,698, passing touchdowns, with 144 and completions, with 2,184.
Brunell was instrumental in getting the upstart Jaguars to be taken seriously as a legit NFL contender.
Aaron Brooks, Matt Hasselbeck and Mark Brunell were three success stories from Green Bay, but there was another former Packer that deserved his own slot on this list at #3.