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because he realized the great journey was a lie

The UNSCDF and Elites would have been massacred by the Loyalists and/or Flood if they fought seperately, even though they barely had a chance allied. The only thing that saved both of the races was "Cortana's solution." In a head-on engagement with the Flood, the UNSCDF and Elites would mostly likely have been slaughtered without much of a fight.

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