User blog comment:Miskos3/Fairy Tail Episode 245: Tartaros arc: Hell's Core, Review/@comment-37.204.83.132-20150808095121/@comment-5894890-20150808181209

^LOL. Oh this one isn't a bad theory either :D, in the preview they did mention only Rustyrose being a survivor of Grimoire heart, but not the other two.