User blog comment:B214/Volume 22 spoilers/@comment-30289101-20161022000600

I wonder if making Bova use 3 pawns instead of the empty Rook slot is a hint that we'll be getting his official Rook sometime during the tournament. I suppose it could be Elmenhilde, but I feel as though she's more suited to pawn(s). Issei's not exactly the greatest strategist, but he does have Ravel and apparently Bina to help out, and from a strategic point of view, assuming you can fill your unregistered slots in the middle of the tournament, leaving your 8 pawns open for a potential God class recruite is better than having a Rook and 5 Pawns.