Good lord. Cam does not have the explosion of Mike Vick or any of the elite RB's in the game. Vision maybe agility, not so much.
Elway was absolutely known as a runner, you know he has over 3400 yards rushing....
I am not saying that they are the same player, just that when I think of Cam, I see a little Elway in there.
Desire to win is one of the big reasons. Compare him to Steve McNair, or Fran Tarkenten or whomever, but IMO there is ton of similarities between him and Elway.
P.S. Their combine 40 yard dash numbers were almost the same.
I will give you the little of Elway bit, but clone? No way. Newton had a little more than 1/5 of Elways total rushing yards in his rookie season. Although I do not see Cam running as much the rest of his career, but you never know.