Jesus made the ultimate sacrifice and provided atonement for all of the worlds created, and all of those yet to be created.
If I were a young scholar at the new MI, my interest would be how Mormonism grappled with philosophical problems, having rejected philosophy and embraced a "science only" attitude. Contra Dan, Mormonism is thoroughly materialistic and to a fault. It's almost as bad as Richard Dawkins, while Dan tries to portray it as the polar opposite. It's a total burn on Dan, to be honest. Almost as bad as mistaking the Warsaw hotel for Sharp's personal residence. Mormonism is very much like New Atheism in that regard. And so here's one more point of rebuttal to the "sex only" theories, and that is material beings reproduce by sex. If you've rejected "immaterial matter" and all the "thinking about thought" Aristotle nonsense, then how family relations expand into eternity becomes an interesting problem. Unfortunately, the problem is philosophical in nature, and so the Hellenist bullet wasn't dodged, and now you're working through a calculus problem with an abacus -- but that in itself can still be interesting. You've locked yourself into this hugely complex mess, and how are you going to get out vs. those who eliminate mechanical components to simplify the problem as much as possible?There is one school of thought in Restoration theology that there is progression through roles in the Godhead, from Holy Spirit to Christ to Father. Not all armchair theologians have accepted that Christ was the savior for all the worlds.
Blake Ostler actually has a great summary of a lot of this stuff. I think it was Blake. Anyway, Christ dies for everyone in the worlds his father created, there isn't a savior for every world. So are the worlds where Christ didn't die less special than the one where he did die? Well, that's us, of course! The special one! But then, who died for the sins of the worlds God's father created? Well that could have been our very own heavenly father himself! We're so special, that our God was also the Christ of his father's world. But what about God's father's father? Who died for the sins of his worlds? Now you're stuck, because maybe that was another God? The problem is that somewhere, there's a God three rungs up who was the Christ of his world, and whose child and grandchild were Christs of their world, and so the inhabitants of that world would be more special than us. This is one of many speculative problems that arise.