Not really. Every "little" group will have their battle lines. That is not really different. No matter what would happen, groups will emerge even if it is just a neighborhood protecting itself. Those groups will merge into larger groups that they either agree with or are forced into.. so on and such. This is not going to be a "American Civil war" type of situation. Things like this are currently happening all over the world and have been for decades. Look to those as a model. "Collapse" always ends in groups building power and recruiting people and fighting for whatever reason they decide to or are told to. I guess it depends on what you think "official" is. In a situation like that... Official is who has weapons, ammo and food, medicine.