User blog comment:IamJakuhoRaikoben/Chapter 457: Naked Battle, Review./@comment-24784846-20151019040948/@comment-25324252-20151019192354

If Laylas death wasnt important, Mashima would have killed her in X778 or X776. He has repeatedly made the number 7 and they year x777 very important. I dont believe Mashima would just happen to write that the deuteragonist's mother died in that year unless it was of importance