I think we need to scrap the league system. I have no idea which league is where in comparison to another, so it's just pointless. Just remove it and keep the rating/#rank. Also re-do ranking icons.
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I think with the new ranking system- we need to scrap leagues and re-do the symbols. Like you say we all associate the rank ranges with the old system, making us all confused. Fresh ranking system = Fresh icons = Fresh start.