User blog comment:Miskos3/Fairy Tail Episode 215: The Snake Charmer Ophiuchus, Review/@comment-4489126-20150110050935/@comment-1359322-20150110051927

Well Yukino was able to use two keys at the first time and has the 13th Golden Key when introduced so maybe she does have knowledge on the Urano Metria. Hey at least it's better than having Hisui suddenly becoming a Celestial Spirit Mage.