they already had Rivers. In essence, Brees was a bust prior to 2004, so SD drafted Rivers, then the light went off and Rivers sat all of 2004 and 2005, until Brees hurt his shoulder late in 2005. They let him walk and the rest is history.
Brees simply got with the right Coach in the right system.
He is a perfect example of a guy who excelled after a fresh start.
Favre had the same experience leaving ATL by trade to go to GB.
Dallas has a handful of examples or near examples: Jimmy Smith, groin issues; Columbo, leg injuries; Laur Robinson, depth issues in SD; Ro McClain, bipolar?/attitude issues; Pacman Jones criminal issues....
Most high picks will get a second and maybe even 3rd chance so it isn't rare for them to make it once the stigma and expectation is gone.
End of the day no decent personnel office is ignoring former 1st round picks with cheesy talking points about them not faring well elsewhere because it really isn't true and it is never smart or write off talent in any wholesale fashion.
But busts often are busts for a reason. Just have to discern the reason and go from there in any evaluation.