User blog comment:IamJakuhoRaikoben/Chapter 383: Surfer Lucy, Review./@comment-24913871-20140511094856/@comment-24913871-20140511131906

ummm.... yea ...after the zeref arc mashima can dive into unreveled smaller plot points in the completed arcs (as the you mentioned about Frosh)

and yeah the dragons .... if it isn't revealed in the Zeref arc then there's that ... but mostly everyone in the series have talked about Zeref and acnologia ...so mostly everything will be revealed in the zeref arc