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In high definition baby!
The game has to be balance. A Grunt Vs.a Spartan would be off the scale!
Almost only counts in horse-shoes and hand grenades.
id go with a brute, hunter, ODST, and possibly the Jackal and Grunt if they made certain things for them to level the playing field.
Yhe only other model that could be logically included is the Flood Elite. It would have the same specs as the regular Elite.