User blog comment:B214/Question and Answers 3/@comment-25222726-20140720220331/@comment-24098614-20140721075350

The thing about Rivezim being mentioned as a Super Devil was suggested much earlier than that because when I read the series they were mentioning that a third Devil as powerful as Sirzechs was missing, and I knew that there was another Super Devil before Volume 16 because it was mentioned in Animesukiforums normally I don't pay attention to the rumors but it proved to be true.