None of the propaganda before release turned out to be true. It was evidently meant to sway you into the wrong direction. Especially, the whole Locke vs Chief thing. In all honesty, the whole Locke vs. Chief concept was completely elementary anyway. No reason for two UNSC Spartans to go up against each other, not when both appear to be good people in all their back stories.
That cloaked Chief is in the artwork of the loading screens that provides tips, but not in the game. I feel like a whole lot of story is missing in this game and was stripped out.
All it did was leave me with questions that can't be answered by the next game, but needed answered in this one. Why wasn't Blue Team formerly introduced to fans who don't know them? There should have been a mission where, as Chief, you had to locate Blue Team. Likely, they were all split up and had responsibilities...as a matter of fact, what were Kelly, Fred and Linda doing, prior to teaming up with Chief? How did they re-acquaint? Did they able to drop their assignments and responsibilities to help Chief? Did someone pair them back up together? Or did Chief call out to them and they abandoned their responsibilities? Did they happen to be stationed at the Infinity when they reconvene? Why was Chief alone and cloaked in the promo trailers? Was that before he hooked back up with blue team?