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In the halo 3 trailer when she says something about gods and demons. If you listen Cortana says in her voice gods but when its says demons its in Graveminds voice.
she isn't she is fighting off the gravemind because he is a virus, and he knows nothing of a symbiotic relationship with another being
The Gravemind has been around for unknown amount of time. He could be as old as time itself since he is already 100,000 years old. Plus Cortona is inside a Covenant ship, which is forerunner tech used by the Covenant again. Only modified, so when he has Penitent Tangent, he may of absorbed his knowlage of forerunner computers and taken control of Cortona.
Halo 3: CollapseChapter 20, Revelations, is up (update 11-14-10)The MirratordΩ
I think she'll "posess" 2401 and teleport out of High Charity.
Remeber At the end of Halo 2 the Last movie clip. The Gravemind surrounds Cortana and Cortana says "Shoot". Cortana is captured and consumed possibly. Cortana and Guilty SPark working together?