I know for a fact this has probably been asked many times, so you can lock if you want, but I was just wondering if the Didact is dead, or if anyone even knows.
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He's not dead because in Spartan Ops, the Prometheans are still lit up orange. This means that they are still under the Didact's control. If he was truly dead, the Prometheans should've reverted back to their blue defensive status.