What did 343 put into Legends that is relevant the future Halo's? I like to think that the Chief is eventually going to have to return to the Lesser Ark and find the Gravemind to get Cortana back. I've always wondered if the Gravemind made a copy or kept some fragments of Cortana, considering the extensive damage he did to her, and what she first says to Chief when he finds her in Halo 3 ( I can't really remember what she says exactly, but it's along the lines of her "not being who she used to be").