Reporters saying she is Elphaba is likely them just using the name out of familiarity. TVLine actually removed “Elphaba” from their article, so I’m thinking they won’t have the rights to the name. If Disney couldn’t get the rights to Elphaba for Oz the Great and Powerful, why would they for Once Upon A Time? Especially when it’s owned by a rival studio. Universal owns the rights to Wicked.