It might be hard on the team, think of Halo 2 as a example.

Delta Halo and Regret were both the same map, just with different BSP loads.

Sacred Icon and Quarantine Zone are the same thing. Just different BSP loads.

Although High Charity, Gravemind, and the two arbiter levels based on activating the ring (I cant for the life of me remember the names :P) Were the levels that not played together.

What Im trying to say is: Halo 2 had that system of where it split a map in two, allowing a bigger campaign, but in reality, it was two maps combined into one.

Sorry if this doesnt make sense.

Edit: Lol same post time :P