I have not heard of the 'other worlds' idea before. May I ask what makes you think that its actual 'worlds' rather than, perhaps, different...ah...dimensions. We could say, for example, that heaven is not necessarily a place somewhere up in the sky, but another world separate from ours that we cannot see or perceive. If that makes sense. We could also say then, that Hades, or sheol, is also another 'world'. Just a thought, and wondering what you think on it!
In terms of what I think Michael Heiser thinks (since I suppose that is where I am in a sense 'arguing' from, whether or not it is accurate), he would say that the 'Council Members', or at least some of them, were assigned over the different nations at the Tower of Babel incident. God, having been defied by man once again, washed his hands of them, decided he would pull from a barren couple his own miraculously conceived peoples, and handed off the rest of mankind to be shepherded by his Council Members. These 'watchers', as they were apparently called, were to care for them, as they were still image bearers of God, and call them to godly living. Instead, they enjoyed being worshiped and it is in this event, rather than the Genesis account that we see the majority of heaven 'fall'. Of course we still see Satan, the ultimate rebel, defy God and cause the downfall of man in that devastating event. But nowhere in Genesis does it state that Satan took a third of the angels with him. In fact, Heiser says, the only time in scripture that 1/3 of the 'stars' is mentioned is Rev 12, which is clearly talking about the birth of Christ...which happened a little after the Eden event!
Anyway, Heiser points to this verse:
When the Most High gave to the nations their inheritance,
when he divided mankind,
he fixed the borders of the peoples
according to the number of the sons of God. -Deuteronomy 32:8
And then also points to Daniel, where he was praying, and God sends and angel with an answer, but the angel was delayed because of 'the Prince of Persia', and had to wait until Michael came and fought the Prince. Basically, the idea is that the nations have these 'Princes' who used to be Council Members. He goes into several more verses that flesh out the idea. He also uses Mesopotamian texts to prop up the other side of it, which is interesting. He says he's most careful never to use extra-biblical texts to 'fill in gaps' in scripture, but they can be useful when they provide, as it were, the 'other side of the story' from the 'gentile' side of things. When the two seem to match, the idea holds strength. For example, the Mesopotamian people used to bury little statues in the foundations of their houses for luck and strength. Statues of their 'gods'...statues called 'watchers'. Watcher is the name given to 'holy ones'...angels...in several scriptures.
Anyway....that's how he argues it all. It seems fairly convincing and it's certainly interesting. I'm not completely sold on it, I'm chewing on it at present. I'm not sure it's really something one must ever come down on solidly, as I can't see it impacting my walk or faith. But I do like a new idea to ponder on now and then!