We often talk about NFL 'coaching trees' but what quarterbacks have produced the most notable backups who've gone on to be starters/stars?

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The original was posted on /r/nfl by /u/today_okay on 2025-04-19 22:48:57+00:00.

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For instance, Brett Favre’s “QB tree” includes Aaron Rodgers, Mark Brunell, and Matt Hasselbeck… all of whom went from backups to stars. Who else has produced notable offspring?