User blog comment:B214/Volume 17 spoilers./@comment-117.193.172.96-20140220052656/@comment-117.193.172.96-20140220151215

No, I really doubt him being high class devil matters anymore. He's already clamied the title of being the hero of the underworld. Him having surpassed the power of an average High class devil is already known. Whole of the Underworld knows about their relationship. All 4 satans as well as the heir of great king have acknowledged it. Plus he's already introduced as Ise Gremory in the show. Rias has to marry right after university graduation. They may get engaged once she's done with her high school. Clearing, the right of passage was after all just to prove his eligibiliity.