Not sure about the terminals, i beat the game this morning and went straight to bed and havent touched it yet for the remainder of the day but we'll see.
You're very right about the focus on chief, the storypath you spoke of could very well be the direction they plan to go. It seems like the most feasible route while retaining a damn good storyline But as said before it definitely would be a whole different turn for the halo franchise.
From a huge galactic war focal point as the main story to an individual and personal story with the galactic war as a background would be a strange transition to see but could be ingenious if they pulled it off right.
Though at the pace and gametime this kick off had i have little hopes. =/