User blog comment:B214/Question and Answers 3/@comment-4547267-20140720022758/@comment-1359322-20140721154740

Because Evil Pieces cannot mix and match. A Rook and Knight Piece cannot be used together. And A Pawn and Bishop Piece cannot be used together. And well there's nothing much about it actually. A High-class and Pure-Blooded Devils are automatically given the right to obtain Evil Pieces, unless if they reject it. And those High-class Devil don't need to have a King Piece inserted in them, after all Evil Pieces functions through the King's Demonic Power. So there's really no need to create any King Piece from the start.