All I know franchise changing qbs come in all different forms and different back grounds. Analytic guys have hammered Allen all off season but the old scouts have not. Of the last 30 years the qbs who have said to have once in a lifetime arms I would say would of been, Allen, Jeff George, Jarmacus Russell, Brett Farve, Drew Bledsoe, Matt Stafford, Aaron Rodgers, Andrew Luck, Ryan Mallet, Jay Cuttler and Carson Wentz (top 10). Most certainly some have busted to an epic level but for those ones that didn't there was a common trend. The ones who didn't showed tremendous work ethic and coach ability. Just like any professional talent trumps all and it's how you harness it that separates it. Sure half those guys busted but they were nightmares to coach or were extremely lazy. Even someone like cutler wasn't a bust and if his teammates liked him and was coachable would of been that much more successful