Wait now I'm getting extremely confused. I thought it was confirmed in Halo 4 that you could only have the BR, DMR, Carbine, Assualt Rifle, and Storm Rifle as primary weapons in War Games loadouts. Where is everybody coming up with snipers, rockets, and shotguns?
On a small side note you would also have to choose a grenade. As a BTB player I would have to go with the plasma nade for its anti-vehicle effectivness. However if the Promethean grenade was given a speedier detonation time than that might be more effective in an anti-vehicle role.