User blog comment:B214/Question and Answers 4/@comment-24098614-20150214225932/@comment-24421137-20150215180518

Your assuming that Diehasuer can over come Sirzechs ability, we would have to wait and see the full extent of how diehauser abilities worked before that assumption could even possibly be put into an argument.

Also you can't assume that Shalba isn't in maou class just because Diehauser is in it, how Shalba can't be in it because one guy is in it doesn't make sense, he maybe in the lower end but we can put him in some where at maou class. Also the assumption of him being as strong as Beelzebub could be considered right as we have no idea how strong the originals were, and probably will never, so we have to go by the assumptions of characters who would probably know how strong the Maous were.