In short I think Halo 5 will stay with Team Osiris for a while then during that time they will be sent after Blue Team and will have likely teamed up with the arbiter by then. Also in the first mission I think it’s safe to assume the get Halsey but whether they kill Jul or not is the question, he is a good warrior but I don’t think he can stand up to guys like Arby who seem to be older and more skilled. I honestly think he should live because of his story in the books but if he dies it means either the covenant shard will soon die off or maybe some really bad— elite will replace him and be one of those surprise villains later on. Then after say 2-3 Osiris mission it will jump to Blue team I honestly don’t think the rest of Blue team knows what Chief is trying to do, whatever his goal is I don’t think they even know he is involved with the guardians and to be honest I don’t think he is waking then up the one in the first place, in the first Halo 5 trailer the guardian seemed to awake on it’s own and it seems to be an individual out of the rest it also seems a lot smaller, could it be doing this? At this point I don’t have enough puzzle pieces to speculate upon the next paragraph is just theories, and one mind blowing fact!
Now first I think the Arbiter will turn on Locke or convince him not to capture Chief because in the first MCC trailer he say this “The seeds of our future are sown in his past” now watch this video to know what I and Arby are talking about before reading onward, oh and some may consider the video a spoiler to an extent Mind=Blown by this vid now hows does Arby even know about this I mean really or was was his quote just BS to hype the community don’t know but I think the Arbiter will have a much larger role than we thought. Now why and the guardians waking up all the sudden, this is my theory in the Forerunner saga by Greg Bear the flood take over ships and Technology of the Forerunners and even the Precursors if you know what they are and just wrecked it all caused Halo’s activation. I think the guardians are a last minute safeguard for the floods return, so that the flood can be destroyed without using the Halos and by last minute I mean last second because the Monitors obviously never considered them an option for containment unless they were made before they got the chance to know about the guardians. What I’m saying is I think the flood is returning in force and I don’t mean High Charity covered in flood big, like Keyminds, Graveminds, and millions of other flood coming at us at once big.