Smith deserves points for longevity, which is why he has many of those longevity-based records. YPC-wise, though, it's Brown-Sayers-Sanders-Payton-Smith, and unfortunately, 4 of those careers were cut shorter than they needed to be. Smith didn't do anything spectacular, he just did it long enough to get his all-time records. Watching Brown, Sayers, Sanders, and Payton was spectacular. Smith deserves consideration due to his longevity, but the other 4 were simply better at what they did for less time.