User blog comment:B214/Talk About What You Want! 3/@comment-25290120-20141125182448/@comment-24468758-20141127142919

She invested her 8 pawns quite well as she reincarnated the only existence that holds the powers of the four strongest dragons: Great Red, Ophis, Draig and Albion.

I don't think that much devils would be able to reincarnate Issei as he is now even with two rooks or mutation pieces.