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To avoid potential arguments, I suggest defining the criteria for accepting (or rejecting) players right away, so that later there won't be complaints like "he was accepted, and he's strong, I wasn't accepted, and I'm weaker, etc."
I decided to base it on PvP experience. For example, one of the registered players has 2.5 years of experience... and that will be the maximum allowed for now. Plus, there will be some subjective judgment from the coordinator about who to accept and who not to. Anyone can apply, but if they're not accepted, then they're not accepted – that means they should just play in JK.