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I don't recall any instance where a team for any resource was formed based on a sporting principle. The organizer always determined the roster, with adjustments based on public opinion.
And that's correct, because there is often not enough time for selection, and if there is, it's a short amount of time, which means the objectivity of the selection results is questionable. And people's opinions about a player's strength are usually more objective because they are based on a long history of games and tournaments.
In other words, to be included in teams, you need to consistently demonstrate good results or good gameplay in internal tournaments. This is much more difficult than winning a single qualifying tournament.