User blog comment:IamJakuhoRaikoben/Chapter 449: Mavis & Zeref, Review./@comment-26884814-20150824200714/@comment-25962249-20150825011722

He never said she was just as powerful as he is. He simply said that she is super powerful, and being able to use spells such as Fairy Glitter, Fairy Sphere, Fairy Law, and law is more then enough to prove that.