User blog comment:B214/Question and Answers 3/@comment-4547267-20140707180133/@comment-1359322-20140708000726

@15sok, what the hell is a Super Devil Rank, there's no such ranking in the first place. The Super Devil was a term coined to Sirzechs, Ajuka and Rizevim who all surpassed the normal limit of a Devil, and reached their level of strength, it was never a rank, just a term. @Otaku, Issei didn't learn that from Riser, he learned that by watching other Devils and advise from many people like Tannin, Rose, Azazel, Sirzechs, etc. Issei himself never actually thought about diverging from Riser's peerage until recently because back then he still isn't Rias' boyfriend. But now that he's Rias' boyfriend and her future husband, Issei cannot only think about personal pleasure, he needs to support Rias and help Rias maintain the Gremory clan name. It'll put a shame on Rias and the Gremory if Issei's peerage is weak after all. So what changed Issei isn't Riser, it's experience and responsibilities.