I believe the Warden is going to utilize Alpha Omega's most interesting and charismatic asset and flip him against us as a major antagonist. Just like the original Brutus in Mob/Blood holding the crews in purgatory for the Shadowman, we could see Rushmore take on a very similar role for the Warden, especially with the purgatory theme the new map's teasers have been hinting at us.
It would make sense Rushmore could have survived the dark aether implosion at the end of BO4s story, and if the rumors are true that the major threat of this story wants to restore the original multiverse, who is a better character to utilize than only one of two entities in the entire lore who experienced both Ultimus and Primis in one place (the other being Avogadro).
With Rushmore's deep knowledge of the previous world and his direct experience with these crews, this could have a direct link to what motivated the Warden to bring the new version of our old crew to the dark aether in the first place. It would also create a unique dynamic where, being corrupted by the Warden, Rushmore would see our new crew and become antagonistic with skewed memories of his downfall due to these very characters, which they technically were.
We've already seen what the Warden could do with OSCAR using Dean Roth's memories, ripping directly from the IW universe as seen with the cabin in Ashes and the trinket on Astra being directly from Spaceland. And what are the odds the most recent map gave us the original PAP machine? I think we're starting to see more and more elements from the original story as the Warden rips them from the hyper intelligent database that is Rushmore.
What are yalls thoughts? I think Rushmore's personality would make him a standout elite enemy, like Uber Klaus but with even more flare and a more interesting set of abilities.