^ THIS!
Even if DNF is a hidden statistic, the game should be smart enough to recognize patterns, like someone who quits every time the get taken down, or just dominated on the ground, or every time they're about to get submitted.
The game should then use this variable in the fight-matching algorithm so quitters end up facing each other, and the adults who don't have a high quit % (giving a cushion for the occasional quit due to laggy game etc.) are matched with one another - or at least on the margin the game attempts to meet the criteria just explained. This might be hard with such a small community, but it might help without anyone knowing any difference