User blog comment:Crimson and Darkness/High School DxD DX.5 discussion/@comment-38501836-20190414093523/@comment-39072703-20190414100555

I thnik if she was a pawn she'd require a few pieces or 1 mutation piece but i dont think she'd require a mutation piece knight or rook. If she was being reincarnated by Rias she might but Issei is a heavenly dragon class king so I'd imagine he can afford more powerful servants for fewer pieces.