I understand your reservations, chicken vs egg is a dilemma isn't it..

Maybe this helps. One could easily argue that Brees and Mahomes are similar talents and either would be successful anywhere they go. Sean on the other hand has yet to show that he can do anything notable without Drew. Does Sean get credit for getting Drew into a Saints uniform? Undoubtedly. Is Sean responsible for Drews success, I cant give him that one and if we believe that Drew would be successful anywhere he went then that would include a New Orleans Saints without Sean Payton. All of my roads are still leading back to Drew Brees.