User blog comment:B214/Question & Answers 5/@comment-191.112.97.123-20150717051816/@comment-1359322-20150717110706

Rizevim is known to be much stronger than the previous Satans, and Falbium and Serafall are said to be as strong as the previous Satans, though there's a chance that they are stronger than the previous Satans too just not to the extent of Sirzechs, Ajuka & Rizevim.