Obviously the Vex only want to write themselves into the universe to help accomplish their goal of complete domination of the cosmos. However, the rest of that theory is perfectly plausible...
...I might consider tying that theory and the theories in the replies so far into my own. Would you mind?
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Are you talking to Bullgod or me? If you are asking me, I say go for it. I like the idea of my comment being built into theory about this world.