Hold on, question, how much have you actually seen of Persona? Because some of these claims are WILDLY out there.
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I'm pretty sure this affects far more than just Persona being 1-C or not so I didn't want to undermine the original topic by arguing over it extensively.
Now I'm sure there are cases where information from the guidebooks can be used, but context matters extensively. Simply mentioning and explaining how Jungian psychology works in a guidebook doesn't mean it just automatically applies to the verse itself, and even if it did, you'd need to prove that "Personas", "Shadows", "Collective Unconscious" and other such terms function the same way in the game as the terms they reference.