Just as how the game registers when you join a losing match, lose the match, and you do not lose valor points... It should register, when people back out during a competitive match, that the team who are in a 1v4 2v4 or 3v4 disadvantage, will not lose glory points. In theory, will bring back others who do not play competitive anymore and it will become a better experience.
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Its easier to win survival with less teammates. Clash too.