User blog comment:Mnzombie/Issei's Peerage/@comment-95.232.176.87-20130916210615/@comment-9339850-20130916211121

1. Rook =/= Bishop, your therory about Kuroka can never work.

2. Irina is an Angel, for her to be Issei's Knight, she would have to Fall from being Micheal's Ace, which wont happen because I believe the author wants Issei's harem to be diverse, Akeno is already a Fallen Angel so having Irina be another fallen angel would be boring.