User blog comment:B214/Volume 17 spoilers./@comment-117.193.172.96-20140220062652/@comment-1359322-20140220073230

Issei would still remain as Rias' Pawn even after Issei becomes independant, but since Issei's own peerage won't be related to Rias or the Gremory, Issei can't get their support on that. As to the Peerage being Harem thing, is it even important, Issei already has a harem, it's way better for Issei to focus on skills and abilities when forming his team over gender. Even Issei has acknowledge that.