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It is true that Gollum's isolation could be a cause of the split personality. However, there are those instances where the Ring seems to cause a change in behavior in others. Perhaps these moments of the Ring acting on the darker side of the person is how it begins to create a new personality in them. If the Ring is creating a new personality I don’t think they would start referring to themselves in plural right away. But perhaps after years of changing personality between the normal-self and the Ring-influenced-self the Ring side starts to develop its own voice which is where the referring to oneself in plural thing begins.
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