Picture this: “Halo, Black” featuring black team before they died. I would love that!
Gray team would be more likely seeing we have no real clue of their whereabouts.
Both ideas seem very interesting 
Wouldnt mind seeing this.
As a game or a movie/web series?
Yes. I loved black team. How about a red team game though? I mean fps and not halo wars.
Grey Team is like a distant memory no one might be able to grasp in the Halo Universe. They are literally MIA behind enemy lines.