i believe that 343 has begun to bridge the gap between humans and their ancestors. i think master chief will have to become an enemy of the unsc in his fight to lead mankind to ascendancy and have them protect the galaxy as the librarian wanted… this has all been the librarians plan from the beginning, she is the guardians, always in the background watching and waiting to ensure humanity takes the mantle of responsibility into our own hands
Why do you believe that chief will have to become an enemy of the UNSC though? Only ONI has shown signs of ‘evil’. Not the UNSC itself.
As WarmerToast has asked, why would John fight against the UNSC? He was raised and trained to be a protector of humanity, I see no reason for him suddenly turning his back on them because Cortana died.