statistically, if you're better than everyone around you, the other team has a 5/9 chance of having a feeder/the worst person in the lobby, and your team has a 4/9 chance. this works out in practice as well, nearly every person who charts their KDA and objective taking versus their elo climb long term has shown that if they're doing better, they climb.
As for referring to someone as superman, its called the Dunning-Kruger effect. If you are in that elo, 1 of 3 things will happen. you're not good enough, and will lose consistently, and will drop. you're too good, and will rise because of the wonders of statistics (and carrying like a boss) or 3: you deserve to be there until you get better, but cannot see that you need to improve. thinking of yourself as superman blocks this, and makes you play the game like you're alone on an island. which consistently loses games because you're not working with your team. if you watch diamond+ games you can see that in soloQ they work together wonderfully with ganks, counterganks, split pushing, and objective taking.
This is a team game and making it seem single player is a sure way to lose more games.
