User blog comment:IamJakuhoRaikoben/Chapter 450: Alone in all the World, Review./@comment-756329-20150831122225

This chapter explained a lot that many already assumed. A great deal of us including myself saw Zervis coming after Fairy Tail Zero (especially last chapter), after the last chapter we also saw Mavis accidentally killing Makarov's mother, but now it also explained my Makarov is so devoted to the guild as a "family" of misfits like himself and probably why Hades became Fairy Tail's version of "Magneto".

This also explains why Zeref wants Mavis, he loves her, but I also think they'll reveal her love for him created "Fairy Heart" a method to kill him akin to how she lost her life