User blog comment:B214/Volume 22 spoilers/@comment-24593185-20160722022934/@comment-1359322-20160722105153


 * 1) Ravel is a Pure-blooded Devil yet she's Issei's official Bishop.
 * 2) Rossweisse is still a part of Rias' actual peerage but she's joining the tournament under Issei's team. So you can join under another team despite having your own king.

These two points alone already default your entire argument.