User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-23847729-20141105105810/@comment-1359322-20141111003234

Issei would still be Rias' servant even if he becomes High-class Devils. Plus i was stating the Vampire mentality, if the Vampires who views Pure-blood more highly than Devils, do you think they would bother to respect Issei who isn't even a Pure-blooded Devil.