Why do you think people say Elway couldn't win a superbowl until he got a running game?
Because he always choked in the Super Bowl. The guy went to the Super Bowl with the #1 defense in the league. He had help. His teams may have not been loaded on offense but he wasn't alone and he usually had a pretty good defense.
How do you explain that every time the Broncos went to the Super Bowl Elway had very mediocre stat's? How about when in '87 Ken Karcher helped them beat the Raiders and KC at Arrowhead to go 2-1 without Elway? I thought the only reason they won games back then, since they were terrible other than Elway, was because of Elway's "magic". It certainly wasn't his onfield numbers.
But you seem to keep losing sight of the fact that the thing I'm arguing is there's no basis for him to be #2 overall, not that he wasn't a good QB.
There are reasons to question just how great Elway was though. The biggest argument in his favor is that he did what he did with no help. That's a myth. They may not have been household names but he had good teams around him. I give him credit for beating Cleveland each time he had the chance but that feat does hamstring any arguments about the first 3/4 of his career. Getting there is getting there but that was the only team he ever beat. And everyone beat Cleveland.
I'm surprised that you haven't talked about the coaching aspect of Elway's career but it's something that I've considered. The Reeves/Elway relationship wasn't one of the best and many have argued that it's because of Reeves that Elway was being held back. With the improvement Elway made under Shannahan I can certainly entertain that possibility and even agree with it to a certain extent.
I think Reeves was one helluva coach though and it's probably more of a case of Elway and Reeves not meshing. I don't think Reeves was a bad coach for QB's either. Elway, Simms and Chandler all went to pro-bowl's under his coaching and Chandler might have been the best fit for his type of game. He had his best back-to-back years under Reeves and put up numbers that surpassed Elway's under Reeves.
Elway under Shannahan did much better and I think learned to be a better QB but again, there's a catch to this line of thinking in terms of Elway's greatness. Brian Griese led the league in passer rating after Elway left and Jake Plummer put just as good of numbers as Elway and Griese. There is the possibility that it wasn't so much Elway being great but Shannahan's system was good to QB's.
The Broncos were able to have success without Elway at different points of his career. From '83-'91 the team was 9-4 when Elway was out of the lineup. In '98, a 36 year old Bubby Brister was 4-0 when Elway was out. Those Broncos teams were very well-rounded and not nearly the handicap that some try and make them out to be to Elway's career.
Sammie Winder went to the Pro-Bowl twice, Bobby Humphrey went to the Pro-Bowl and had back-to-back 1,100+, 7 TD seasons, Gaston Green went to the Pro-Bowl and had a 1,000+ yards all from '83 to '92 under Reeves. When Shannahan got there in '94 Elway had guys like Anthony Miller, Shannon Sharpe and Terrel Davis all going to the Pro-Bowl.