User blog comment:IamJakuhoRaikoben/Chapters 338, 339, 340: The Great Banquet, The Stardust Essence, & Gift, Review./@comment-5036235-20130706004343/@comment-1359322-20130706011256

I don't think Ravel Tail has any connection with Zeref, Zeref seemed to be using Raven Tail to spy on the Grand Magic Games.