User blog comment:IamJakuhoRaikoben/Chapter 449: Mavis & Zeref, Review./@comment-64.233.173.196-20150824094015

Ok I have a theory. What if in the next chapter Mavis accidentally kills someone. We know it is not Yuriy, Warrod,Precht or Makarov but someone important was killed. What if Mavis killed..... Makarov's mother !! It would make sense and if God Serena is in fact Yuriy then it would also explain basically everything that has happened since his introduction. He would probably blame Mavis for her death and become obsessed over law and it might be why he was declared dead 4 years later.