User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-25560094-20150515042036/@comment-1359322-20150516010303

@anon, but the author did confirm that Dulio is Seraph-class in strength, there is no such mentioning for Strada. Also just like Griselda, Strada was aimed to be a Queen only, meaning one of those skilled Exorcist reincarnated as an Angel while Dulio is reincarnated as the Heaven's Trump Card, the Joker.

The Joker = Mutation Piece for Brave Saints.