User blog comment:Mnzombie/Issei's Peerage/@comment-213.106.131.123-20131105145946/@comment-1359322-20131105151835

First, we don't know if Tiamat can take a human form or not so don't speculate. Second, if Issei takes Kuroka as his Bishop, he'll have to use up both his Bishop Piece regardless if it's a Mutation Piece or not. As for Fenrir's son, they are most likely dead already, if not they might be sealed off together with Loki.