User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.243-20160806162232/@comment-24.113.252.213-20160806174219

What if the Masked Queen is actually a member of the Old-Satan Faction (yes, they're still around). After the leaders of the Faction were killed, the remaining decendants don't seem interested in overthrowing the current government, and since the Bael Clan has lost a lot of it's influence (the curruption of the RG exposed), the Old-Satan Faction might want to assimilate into the current Devil Society. But they need someone with a strong image in the Underworld to advertise themselves, and Issei is a good candidate to do that.