Interesting that, despite free agency, the majority of these QB's have spent their career with one team .....so far. I know it changes this season with Flaco and Foles.
In the past, many Super Bowls were won by QB's that had disappointing careers only to prosper from being able to a good team towards the end
Guys like Trent Dilfer, Doug Williams and Jim Plunket were high picks but struggled on bad teams. They were cut late in their careers but hung around as a backup and then took advantage of injury circumstances to leave on top. I think that always makes for a good story.