User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170208011958/@comment-183.88.184.178-20170208120556

Asia can get advisements from Rias and Akeno any time she want, even she is no longer in Rias's team. Beside, how could Issei become a good king if he is unable to take care problems of his own subordinates and rely on Rias to take care them instead.

Remember, Tannin is a better choice than Rias when it come to mentoring Issei, but there are no need for Issei to be member of Tannin's Team.