The "mentor" quarterback is a strange character with a mysterious job.
Sometimes, he's a former champion on his last legs. Other times, he's a drifter roaming from team to team, earning a lot but playing little, sharing secret wisdom with rookies and prospects.
For a coach, a mentor quarterback can be an indispensable asset. "If you are investing in a first-round pick, you should have quality veteran leadership to help that guy early in his career," explains Redskins offensive coordinator Kevin O'Connell.
Yet veterans might bristle at the label. "I don't look at that as my job," Broncos quarterback Joe Flacco said when asked this offseason if he would help develop rookie Drew Lock.