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I would safely say, no. He isn't. Do the Chief and the IsoDidact have a similar backstory? Yes, but there's no way that the Chief could have the geas of the IsoDidact. [spoiler]Unless 343 comes up with some magical bullshit reason to say that this theory is plausible. [/spoiler]
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Chief susposevly has the isodidact's geas, meaning he shares dna and traits with bornstellar.
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He can't have the IsoDidact's geas. He was never composed.
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