User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-34061653-20181013135327/@comment-33341107-20181018110014

Grayfia is maou class so she would be worth 5 pawns. Since we know that 5 pawn value people can play as knights than they can probably be bishops, if Bova becomes Asia or Issei's familiar for the torunament than Asia could move down to pawn, Grayfia moves to Rook and Roygun moves to bishop, than Ingvild can play as queen, though I doubt that she will Join the team for the match against Rias since shes not needed, paipod is an extension of Paiphone which we know can work through rating games, even without full control over her power, we know she can use her singing to power Issei even without practice, so I think he'll take on Crom, Ingvild will sing causing Lilith and Ophis to resonate Allowing Issei to go True DxD which he'll use to either beat Crom or by entering that form he'll regain all the stamina he lost fighting Crom and go takedown balor Rias while Ddraig finishes Crom