[b]Theory 1[/b]
What if SIVA is being controlled by one of the last remaining Echos of Oryx? Because there are many quest missions where you hunt down remaining Echos of Oryx. What if we missed one and it went to Earth and found/awoke SIVA?
[b]Theory 2[/b]
What if a rogue Warmind awoke SIVA? SIVA needs a mind to control it. So who better than an A.I. who is created for battle?
Comment what you think, and if you want, comment your own theory about SIVA!
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I feel like it's Rasputin controlling the virus. Keep in mind bungie said the rise of iron DLC will have a raid, 'with a twist'