I don't really think numbers are the best way to compare football players because it's such a team sport. Part of the reason for Jimmy's weak numbers is that Shanahan was absolutely raping the Packers and Vikings with the running game in 2019 and there was just no reason to throw the ball. I think if you put Alex and Jimmy on the same team playing the same opponent, you would expect pretty similar results. They are both competent QBs on a good team. Neither of them is really able to elevate their team or cover up weaknesses on their team in the way that a real elite QB can.