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If you're meant to be at a higher Elo, you won't underperform. That means if there's a bad player in the game, there is a 4/9 chance of them being on your team (because it can't be you), and 5/9 chance of them being you opponent. On average, you will win more games than lose and your Elo will rise. Going 5/5 is feeding, by the way.