User blog comment:B214/Question and Answers 4/@comment-4547267-20141004022647/@comment-25051741-20141021163245

Also, until Rias is King of the game, I doubt Issei will actually have Asia & Xenovia join his peerage, because that would screw up Rias's team. Maybe once he's helped Rias attain her goal, there will be a shuffling of personel.

I do see however, Ravel's mom trading bishops with Issei as soon as he gets his EPs. I also wonder what will happen with Ophis?