No then the sentinels repopulate planets using DNA samples they have collected from all halo species. And they are robots, so they wouldn't die.
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In that case Halo wins
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Nope. Droids do the same reviving the Jedi and cloning them. Round 2
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Well then the flood takes over
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Naw, general gravious and the clone army will destroy the flood after the firing of the rings and before the repopulation.
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Then the flood takes over first then the marines and spartans wipe up the rest then the halos get activated to wipe up the rest Or you know... chief solos both