no first level is going to be master chife on earth again seconnd will be arbitor on a ship to the ark that gets ambushed 3-4 more earth as MC next arbitor on the ark then MC killing that big plant
next arbitor fighting on the ark getting to the contrl room
MC on the way to the ark MC fighting his way through the ark to the control room when there you fight half of the boss as arbitor the next half as MC then the story goe somthing like ohh well u blew up the ark but there goona blow up earth and colinize halo or use halo as a weapon ever if the ark is dystoryed leaving the game open for halo 4 IMO