Im on 4 hours of sleep since 8 am yesterday (11:22 pm PDT now), so please forgive my lack explanation and what not. Maybe even forgive me for what I'm about to say.
Rasputin.
In the Story Saladin mentions how Rasputin hasn't been what he once was for a long time. Then while questing today, I nabbed mysteries ghost fragment six... where Rasputin authorizes SIVA usage in response to a break in at Site-6 (Just before the SIVA replication cell). When Rasputin controls the SIVA, which the Fallen pkayed with for a bit till we came in and wrecked them all yet again.
There is no big looming baddy this time. Think about that... Atheon, Crota, Oryx.. and nothing... Friday marks the raid of warmind this tired old Guardian believes. If you can Google the card I speak of, I think you will agree... especially with the semi self aware "I'm crazy, stop" sort of bit at the end.
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It very much could be. All the evidence confirms that Rasputin has known of SIVA for years. He might've even purposely given the Fallen access to it. Rasputin might've done some calculations and decided that we, Guardians, are a threat to him and seeks to eliminate us. He might even be seeking to be fused with SIVA himself.