User blog comment:FairyRaven/Fairy Tail Chapter 424: Avatar, Review and Commentary/@comment-24499036-20150316102445/@comment-9595671-20150316115423

Hades is definitely dead and in Tartarus his soul added Fairy Tail, so I think he's a no go for that. Bora also seems too skinny compared to him and I feel he's also not really bad enough due to the camoes he made in the anime.

Ivan though, I think its plausible, his guild did use to be a Dark Guild and I bet he was able to escape when the Magic Council was bombed. Heck I bet maybe that's why Bluenote was with Orochi's Fin, because most of the villains got out when the council was killed.