Board Thread:Council of Arrowverse Wiki/@comment-9346948-20180216065020/@comment-1783334-20180224033712

The thing with Purity is that you clearly see Julia Freeman fighting her. So they're two entities fighting for control of their shared bodies.

As for that butterfly example, I read it last night and waited this long to reply because I wanted to give it a really long and hard thought and that analogy does not make sense because once a caterpillar becomes a butterfly. The true part of herself unleashed, as you refer to it, would be the manifestation of her powers. This is the physical change, not a psychological one. Samantha's powers manifesting would match the butterfly example. The acolyte had to brainwash or insert a new personality into her to make her Reign. Whether Samantha's powers developed or not when it happened, Reign would still be sharing Samantha's body, but they waited until her powers developed because she couldn't do much as a World Killer without her powers. Likewise, if the acolyte never did that, Samantha would be Samantha with or without her powers.