Salmon is one of those guys that is just smooth as hell playing, I don't know that he kills at the speed some do because he never seems to over extend or get in a bad position but he generally doesn't hit the ground much at all, does fairly well on the scoreboard, and if things go sideways you know he will carry the team through if he gets stuck soloing.
I don't know about you, but I'd rather play with someone like the above then someone who uses tryhard kits all the time to kill quicker, but then you find they drop more then you care to count. It's why I'm not a fan of these lists myself. End of the day, this is a co-op game, so I picked the ones that made the game smoothest for me and generally didn't die, even if they had to carry. I've seen players score ridiculous amounts and yet, because they die in stupid places and generally put the team at risk for their scorewhoring greed, I don't rate them that highly.
Nowadays, I can scorewhore and make matches go quick quite easily, but because I tend to die a lot doing it, I don't rate myself in that top tier bracket. But the same goes for everyone else who does the same. The best players don't die, even if they have to carry on platinum.