My opinion is that the Exo are the result of human essence transfer. The contents of our minds are digitized into an evolving piece of computer software, which is uploaded and executed within a mobile platform.
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Perfectly plausible backstory. Logical too. The mind is the essence and the essential, their bodies a technological house.
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Cylons! BOOM!
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What if Exo are simply cyborgs, and awoken are simply evolved from influence of the travelers powers.
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I believe the Awoken are indeed a branch off of humanity's evolutionary tree. As for the Exo, cyborgs are kinda stale, and they don't really say 'dark and sinister' to me. Now, sacrificing your humanity to become a robot? That sounds much darker and much more sinister.
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Who said they had to be dark and sinister?
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Bungie... At the GDC panel....
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Ah now I remember. Yeah. Okay, I can see that. Maybe to become Exo they had to go through a painful transference also