User blog comment:IamJakuhoRaikoben/Chapter 405: Tartarus Arc: Part 6 - Magna Carta, Review./@comment-83.255.195.39-20141021100043/@comment-7418318-20141022200558

Remember that everyone except for GH was fully convinced that Zeref was long dead. Even the Dark Guilds and cults that revered him believed he needed ressurection.

So at most they would think "Oh, that guy looks like the descriptions of how Zeref looked 400 years ago" or "Oh wow, a Zeref look-a-like".