Consider that is just one example when there are so far many more who declined. Also, you are talking about Walter Payton for crying out loud. He is the exception to the rule.
I watched Payton throughout his entire career. He was a punishing runner and he had more violent collisions than most backs, including Peterson. Payton was known for his conditioning. He was a rare athlete. I realize all this and I admit as great as AP is he is not the equal to Payton.
But, AP is also a rare athlete. He is probably more chiseled than Payton was and pound-for-pound nearly as strong. Payton would get the edge in lower body strength as he would over most backs not named Earl Campbell.
As I also said, Payton played with QBs far below Romo's talent level. Payton had WRs like Willie Gault (basically only ran the 9 route) and Dennis McKinnon (physical WR who was nowhere near the player Dez is), and Payton never had a TE like Witten. AP on the Cowboys with an OL that is the equal of Covert-Thayer-Hilgenberg-Bortz-Van Horne (did you watch that OL during their entire careers?) would give Dallas the best offense in the NFL.
AP >> Murray. If it were just a case of AP > Murray, then I would not care how things turn out. But AP is not only better (>) than Murray, he is much, much better (>>).
I did not research other backs north of 30. I did not feel I needed to. Adrian Peterson is easily the greatest RB of this era. People can argue between Manning and Brady and Rodgers for greatest QB. There is no such argument when it comes to RB.
Peterson will probably end his career north of 15,000 yards. That will put him in rarified air.
And although no back can compare to Walter when it comes to heart and sheer will, AP is faster, more elusive and more explosive.
If I wanted to make a comparison between great DTs, and make a case of Randy White being among the most physically gifted I don't need to compare him to Leo Nomellini, Curly Culp, Bob Lilly, Joe Greene, Merlin Olsen, Warren Sapp and 20 other guys. I can compare him to Mean Joe Greene and if my argument is valid, it can end there.
AP is a rare player who is Canton-bound.
He got 2000 yards coming off ACL surgery with an OL that is not nearly as good as the Cowboys line and with a QB that could not carry Romo's cleats.
AP is going to wear that yellow blazer in Canton and give a speech one day. Do you think Demarco Murray will?