I don’t think Emma can control him, for he has no magic in this world. Even if Emma had magic I believe that it will take both side (Emma and Mr. Gold/ Rumpelstiltskin), to summon the Dark One. As for the theory of him wanting her to be the knew Dark One I don’t really thinks so. I mean, why would you tarnish the savior with that curse? It’ll just turn her evil and something like this could happen all over again. I believe that he wants Emma to help him get rid of the curse. We all know that he slightly resents it because it destroyed his bond with his son and with Belle. But in the end I believe you can’t have “yin” without “yan” so it will be highly improbable.
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