- last post: 01.01.0001 12:00 AM PDT
Also don't forget in the novels she took on more information into her memory than was wise, but she felt it necessary in order to learn about the Covenant. It explained that taking on that much could corrupt her and shorten her life span. She even started having mental lapses due to the massive amount of data she was carrying.
I just don't think Bungie would do something as simple as Gravemind controlling Cortana or vice versa. They've definately got something up their collective sleeves.