Well firstly, we had mob arena, which is your suggestion. But it had a beserk bug. Secondly, we had teams, it was a little thing our players were doing for fun, but it stopped. And as for the rank, I doubt it would be in. We won't get ranks named after anything in the game unless we do the exact function (Ex. GymLeader, Elite... etc.) We had admins and mods as Prof. and ProfAssist. But people were confused at what they did. Same would happen with the team rocket prefix.