User blog comment:B214/Question and Answers 4/@comment-24098614-20150214225932/@comment-24421137-20150215020547

Oh ok I think I know whats happening here, you are comparing the guys from the younger generation (Katerea, Shalba, and Creuserey). Those guys aren't in the same class as the original. Shalba, the strongest I would assume, was only able to get to the original descendent of Beelzebub through Ophis' snake. See those other guys aren't at the same strength as the originals, if we look at the originals who are a lot stronger then them, Sirzechs would not have had such an easy time with him. So if you want a reference at how powerful the actual originals were look at Shalba and his fight against Issei.