Understood. My point is there is a history from way back to now of QBs who were not that great as passers, but their legs made them successful. As for McNabb, I too don't recall him running much, but then I didn't watch him a lot, being a Packers and Commandeers (Redskins) fan. However, the few times I did watch, he had a knack for escaping sacks, career-wise he only rushed for a bit over 600 yards, but that doesn't factor in his scrambling to buy time to throw. I think he was similar to Roger The Dodger, and Frantic Fran in that aspect. So i included him as Richardsonic.
Got no idea how well the Galloping Gator will do, but it won't surprise me if he ends up doing very well. Much as it gags me to say so, he makes me think he's a Will-o-the-Wisp, and with the maneuverability of Herbie, the Love Bug. Providing he doesn't get RGIII'd by some LB or blitzing safety.
I think there may be a conflation in your take. Staubach and Tark absolutely had athleticism in their arsenal but were elite passers first and foremost. Staubach led the entire league in passer rating 4 times and TD's once. Tark even now is 14th in career yards. To throw out a name that's underappreciated in athleticism discussions is Steve Young. He had over 4K in yards at 5.9 a pop. It wasn't his running that got him in the HOF though.
The appeal with AR is simply the idea of front offices thinking "Dear God...imagine what he could be if coached up into being a legit passer with those physical abilities.". Many a track guy has moved up in the draft at WR/RB based on that hope based term; potential. There's been some winners coming out of that group but an awful lot of busts.