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What do you think about the secret 12th terminal. I think it's Precursors. Since the captive said that some of his people escaped the Forerunners.
I think it's Forerunners. "For decades, we've battled an alien enemy we do not understand. Unprovoked, they brought our civilization to it's knees, and forced us into hiding."1: The Precursors made the Forerunners, so why wouldn't they understand them?2: The Forerunners didnt understand the Flood. It brought their civilization to it's knees, and forced them into hiding (Shield Worlds, The Great Journey, etc.).