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I have no idea how arena works but it wouild seem like those who started late would never have a chance?
You're matched up against people with similar rating as your team. The only thing that will hold you down is knowledge of the game, classes, strategy etc. and gear. Gearing up these days is stupidly easy. However you can have all the gear in the world but it wont take you to the top, you still need strategy, team work, and know how to beat comps, which all comes with practice and reading.