I'm not sure what this is.
So kickball, at least what my definition is, is a match complied of whoever shows up with random captains who select players 1 at a time from whoever is in the event. If we have more than 16 people we would just have multiple going at a time or more than two teams per match. There's no bracket style tournament.
You just show up. All classes and builds welcome. Would recommend being at least level 47.
It's how we used to run Kickball PvP on test server back in the day. A more casual way works too, carry on.