User blog comment:B214/Question and Answers 2/@comment-75.93.25.66-20140206044118/@comment-1359322-20140206051308

Rizevim is a Super Devil and the son of the Original Lucifer and Lilith, just his status alone would've made Devils feel obligated to work for Rizevim who carries the blood of a true Satan. Of course Katerea, Shalba and Creserey are descendants of the Original Satans too, but then there's the 2nd point, Rizevim's fame as a Super Devil. Much like Sirzechs and Ajuka, Rizevim could easily gather followers under him and his followers might be more than all four of the Current Satans because of his origin. Then there's also the issue where they don't know much about Rizevim aside from his linage and Sacred Gear Canceller, so they couldn't let their guard down against Rizevim.