Josh Allen is deservingly the dynasty fantasy football QB1 at the moment. His combination of arm strength and speed makes him a fantasy cheat code and the most valuable quarterback to roster in dynasty leagues.Things change, though. Allen's been at or around the dynasty QB1 spot for a few years now, but each passing season puts a small dent in his future value. Someone will pass him in the rankings at some point, but who will it be?Here are five players who could dethrone Josh Allen as the QB1 ...