At the end of the new trailer chief says "your mission is done, agent locke, but min is just beginning." This led me to think, why is Locke hunting the chief in the first place? Cortana at this point, is out of the picture. Why would he go AWOL then? Simple. He knows too much. Locke obviously is with ONI, we know that but think, what has ONI been dying since the events of Halo 3? Well it's been: scheming to take control of the Earth government, attempting to get it's hands on a Covie cruiser, sabotaging the elites so they are now in the midst of a civil war. Quite the list. This info is leaked to MC and he is now trying to bring down ONI before it takes over the UNSC entirely (which it almost has.) Analysis of the two new trailers: You will have a choice of who wins, Locke, or Chief Agent Locke perspective: Locke is a child of ONI, brainwashed to believe whatever ONI does is law. ONI is his equivalent of a god and he will obey. He believes that Chief has brought the civil war to the elites and unrest to Earth and all her colonies. Now he must end it. Bye bye chief. Chief perspective: He's a hunted dog. Except now he's turned the tables. He's a monument to the strength of humanity and doesn't disappoint. Now he has Locke, the poster boy of ONI at his finger tips. He's been hunted, and now he's the hunter. He's a broken man who only knows how to continue fighting. Locke has brought this madness upon the colonies and now chief can end it. His mission has only just begun though, seeing as Locke is only a pawn of ONI. [spoiler]Sorry if this is already a theory. I have no idea, I don't watch those videos. Felt a need to post this though.[/spoiler]