It's certainly up there in terms of difficulty. It requires everything. Brains, processing, arm strength, touch, footwork, throwing motion, leadership, charisma, guts, toughness. That's why I don't think riding the pine or getting thrown to the fire matters much. Either you have all those things or don't. It may take a guy like Derek Carr 5 years to show us them all, but either he will or won't. If he wasn't playing, he wouldn't be any different IMO.