I don't know where you people are getting the idea that Danzig is Fata Morgana. Moss said that Danzig was his uncle, and if Fata Morgana = Danzig, then Fata Morgana is Moss's uncle? Even though she is a female? I guess you could say that Moss was lying about him being his uncle, but he had no reason to.
And if Danzig is Fata Morgana, you need to assume that the entire bed and breakfast belongs to Moss. If this is the case, why wouldn't he meet them directly, after all, May and Moss left on the best of terms.
Personally, I think Melter is Fata Morgana.