User blog comment:IamJakuhoRaikoben/Chapter 440: God Serena, Review./@comment-4999650-20150615163804

It would make sense for Serena to be Yuriy since it's pretty much the only way I could imagine Albareth knowing about Lumen Histoire, considering it is a secret passed down to Guild Masters of Fairy Tail only, but I wouldn't be surprised if Warrod and Yuriy also know.

However, that would be the case if Yuriy has indeed defected. If he didn't, he is probably trying to protect them? I still don't know how Albareth would know about Lumen Histoire. Or they probably don't, who knows, I'm lost.

Also, I'm a bit perturbed of Yuriy getting all these recycled names. First, he adopts the old Magic Council dead fart, and then the Magic Council frog.

OH and I forgot: If that is Yuriy, they could always say he didn't age because it was an adverse effect of Law, so Mavis wouldn't be the only one victim to the anti-age thing~