I hope 343 cleans up their act with Halo 5. Story wise and gameplay. Not having the Arbiter was a major let down in Halo 4, seeing as he is one of the best characters.
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The Arbiter had no purpose to serve in Halo 4's story other than fan service. That they are above such things speaks to their better storytelling.
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Bungie set it up so that he wouldn't have been involved with Chief for awhile.