That the events of Halo was all a dream? He wakes up from coma and you can see his parents next to him, he goes back to his house and gets killed by a serial killer. The end.
What if life is just a dream?
It is a dream within a dream within that dream.
Word on the street was this was the fixed ending for ME3, with it being Chief’s dream whilst in cryo.
It was quickly scrapped due to unpopular reception. ;D
Honestly, you know what’d make a sad, if eventful and interesting ending? A Halo activating at long last, ending the games on a note of revering their namesake- for a Halo, is still the most dangerous weapon of all…