But then we’re left with you don’t believe something that many scientists do
Assuming you are talking about Multiverses again here, because it isn't 100% clear, then I'll just reiterate that while Multiverses are certainly a known topic of discussion and debate, they don't fall into the category of "scientific" theories, and therefore no actual scientist worth a damn really pays them much heed. It is an interesting subject, but since it simply can not meet the criterion for scientific study, it is not scientific. Philosophical, undoubtedly.
What is there to suggest that dreams are limited to the brain?
The fact that there is nothing of any substance whatsoever that suggests anything otherwise.
You might claim my views are extraordinary, but to me, your views are extraordinary
Fine, but again, I'll ask why you apparently don't see the enormous absurdity of going off postulating wild and wonderful scenario, like alternate universes and dimensions, as a means to explain something totally mundane like dreams, rather than the much more obvious, mundane, observable explanations. And on top of that, you keep bringing up "science", despite making all sorts of deeply unscientific claims.
what is imagination? If it’s just a collection of information AI should already be outrunning human creativity enormously. Yet in terms of originality it’s not even coming close (and still requires human intervention) why is that?
I have no idea what point you are attempting to make here, but AI should already be outrunning human creativity enormously is a nonsense statement. AI is the product of human endeavour to engineer some sort of rudimentary machine sentience. It requires human input to produce output, and until such time the machine sentience surpasses that of humanity itself, this will always, unsurprisingly, remain the case. You seem to be making an argument that a 6 year old pupil should be more learned than a 50 year old teacher, simply because the pupil has the knowledge of the 50 year old on tap, which is palpably ridiculous.