User blog comment:Omega natsu2/Episode 201: Delivery, Review./@comment-4449950-20140927025751/@comment-24039250-20140927160310

Regarding Zeref's voice, while I would give it to you regarding it has been a while, I will also say that in the meantime he was doing the exact same voice through Garra from Naruto so idk. Maybe they are trying something new.