1) There could be a connection and there could not. There's almost no evidence to support this.
2) You obviously don't know about the vex and hive origins.
3) Saint-14 is dead in the present :(
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All merely theories so you agree theory 1 may still be plausible
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But it's still not confirmed right? Outside of the simulation he's only MIA
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There is a quest we get about him, and the steps pretty much say he's dead