User blog comment:Mnzombie/Issei's Peerage/@comment-213.106.131.123-20131105145946/@comment-1359322-20131105234843

No it's not i'm underestimating Ajuka or anything, it's simply a matter of consumption, the servant requires two piece to reincarnate, you also use two piece in return, it's only fair to the other party then. Kuroka still has her two Bishop Pieces in her body so Issei will need to use two in return to make Kuroka his servant, not worth it if yours is a Mutation Piece.