User blog comment:FairyRaven/Fairy Tail Chapter 406: The Girl Within the Crystal, Review and Commentary/@comment-4489126-20141027130935/@comment-4489126-20141028055639

I get what your saying, but it's the same for Trial. We know Gray will join FT and thus preventing him from any future death flags. But now we know what happened to Mavis (just not how). The series are in the same boat. We know what happens to the character, but the authors are filling in that blank space of stories of their life prior to the guild (like Gildarts being the first "strong" Mage Gray witnessed after Ur died); this is what I meant originally. And lol, I think the "how" for Mavis will be explained within the next chapter, probs before Zero #5.