User blog comment:B214/Question and Answers 4/@comment-24098614-20150214225932/@comment-24502975-20150215182941

Yes, of course we'd have to wait and see. That's why I said "assuming that ..."

How can there be a "lower Maou class"? It's not like Mid-class or Ultimate-class, it's a literal level at which you can fight on par with the Four Great Satans. And if Diehauser is on the same level as Shalba, well, he won't make for a very intimidating antagonist... As for whether or not he's on the same level as the original Beelzebub with Ophis' snake, I'm pretty sure when the term Maou-class is used it refers to the current Maous unless specifically stated otherwise. There's no reason to think Shalba had his info right anyway when we look at JD.