The Halo 5 story is disappointing *SPOILER*

I saw the trailer about Halo 5 and no one of the scene are actually in the game. I can live with that, but a other fact worries me more.

We only play the Master Chief in three of 15 missions, but we play a story about the Master Chief finding out that his beloved Cortana is still alive and all what we got is the way how Locke try to get back the Master Chief?

I mean where is the dramatic story? Where is lovely story about two people who get through the hell? John is trying to get back Cortana we get almost nothing about Johns journey to her, just three missions. I beg you, give us some new missions with the Chief. I want the real Halo feeling back. You got me with Halo 4, the story was really okay and you could so much more in Halo 5, but what you did in Halo 5 is not really what fans want to say. You could do a 50/50 story telling like 7 Missions with the Chief and 8 with Locke, or just make a new series like Halo: Locke. But this is the main game and the story from John and Cortana…

I beg you, please, give us some more missions and more story about Team Blue/Master Chief and Cortana. I know you said no story DLC, but you would make a lot of people happy, if you do it.