From what we’ve read about 07 is that it was infested with Flood and had numerous Graveminds there. A good amount of Graveminds that I think it was described as a mountain. I believe 07 will play an important role in what’s to come. As we know the forerunners kept some Flood specimens for study. It’s quite possible they kept some of the Graveminds within 07 for study by the local Monitor.
This Monitor could have gone crazy, like 343GS, and could have been talked into releasing the Graveminds from their prison. As how The Primordial eventually got Mendicant Bias to turn on it’s masters…yet that took hundreds of years. These Graveminds would most likely merge into one big Gravemind…that has free reign over what happens on said Installation.
Del Rio also mentioned they were searching for the other Installations. How do you think they will react when they discover 07? Also please give your own theories/ideas too please.