Back in the Halo days, it was standard to have up to a 4 player team for co-op story mode and most multiplayer game types. I don't understand where we got this 3 man fireteam from? I can never play with all my friends at the same time, and everyone I have encountered when needing to use the guided games system has the same opinion. please increase the maximum number of players in story mode/exploration co-op, nightfall, strikes etc..