I will go one step farther and guess that perhaps Regina is behind it all, whether she hires someone or merely “suggests” to a very deranged person whose buttons she knows how to push, but in the process Emma is going to meet someone, deranged or not, who believes what she will not.
Emma may be outraged at the start, but by the end, I don’t think so.
Who knows, maybe it is all Mr. Gold’s plan. We may not agree with his methods, but the result, the outcome is another thing. Depends whether or not he’s trying to truly defend MM or wanting Emma to find the truth.