<Snipped quote by DragonofTheWest>That is just ridiculous. If everything that happened in the respective universes happened in this RP then the Halo-Human homeworld wad glassed thus pretty much ending the war before the first Halo game happened thus Halo 2 coudln't happen and the beginning of Halo 3 couldn't happen
Again the historical accuracy in this RP isn't suppose to be accurate, I've indicated that just because something had happened initially in a previous canon lore doesn't mean it happened here, it all depends on who is controlling who and they decide how and what happened. Sure if there was someone claiming the UNSC and another person the Covenant then maybe there's a problem.
Considering neither have been claimed if you wanted to go in and claim the Covenant and have your history indicate the Covenant had wiped out the humans entirely, that's perfectly fine unless someone comes in saying they want to make the UNSC their faction.