Jerry Rice - Prime example of how hard work, determination, and having an unmatched grasp of the game can boast you into greatness
Randy Moss - Prime example of I'm better than any coverage you're sending, but I'm also my worst enemy.
Moss did two things very well. He ran fast and he jumped high. He never had the full route tree as an option. I don't know why anyone would think that now he can become an effective route runner with the shorter routes, and teams will not respect the deep speed like they did 5 years ago, and the vertical jump is not what it was.