What I wonder about is why you would go out of your way to explain these things in such a complicated fashion, when there are easier explanations available.
Stars are under a lot of pressure, rarely or never really able to "just be themselves". There is a lot they have to suppress because they can hardly ever "switch off". These things need to be vented in some way or other.
Channeling these suppressed emotions and wants into a persona that can express them more freely (because they're not "me") is not too surprising in my opinion.
Sure, this can also be seen as something "spiritual", because it still has to do with dealing with yourself, but I doubt astral projection and possession are the closest match as far as explanations go.
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