Yeah, see, that doesn't work for me. We don't actually know its the singing itself they are drawn to. Also, they allowed Sheryl to come on board to close out her 3 month tour, and she seems to attract them as well. So they think its OK that Sheryl attracts them, but not Ranka? We don't even know if Ranka was amongst the top runners up. Out of all of the likely scenarios, the one that was the most plausible for me was that Leon did it because of Ozma's past relationship with Kathy. I am going to stick with that until I have more information to go on.
Leon could be a big fat cheat, too, and has been nailing the chick who won.