User blog comment:IamJakuhoRaikoben/Chapter 388: Erza vs. Minerva, Review./@comment-4449950-20140613064647/@comment-68.1.178.233-20140613065701

Not sure that necessarily means that the Gray/Silver Father/Son theory has been debunked. "Father and child" is the name of this part of the arc. It could be a theme that carries on until part 5.