I reckon cortana will make a comeback. I think halo 5 and 6 will be about chief losing interest in everything and only focusing on cortana and in the end she'll be stored in on of the didacts terminals like when he stored the ancient humans (now promethian knights) and they'll find a way of reversing the composer making cortana human, obviously there'll be a side threat eg. Didact... But chief will win and 343i will not kill chief off at the end of the trilogy because I'll rip Frank O'Connor's heart out and feed it to Hippo-mice
