User blog comment:B214/Volume 23 discussion blog/@comment-172.56.17.58-20170417051436/@comment-10330822-20170418232845

Pawn is right. In fact, its more like Riser would leave Phenex to join Gremory. Kind of like how Venelana left Bael to marry Zeoticus after she was passed over as heiress.

Riser is the third son, he is not in a position to inherit the Phenex's title of Archduke. So, if he marries Rias, he becomes head of Gremory, and the Gremory bloodline would have both the Power of Destruction and the Phoenix abilities. Which would be OP.

When it comes to Ravel, its similar to what would have been to Riser, she left Phenex to marry Issei, who is the head of his own household.

Also, I dislike this arguement over whether Millicas is the heir or not. He isn't, Rias is. Whether he is the rightful heir or not is irrelevant, because Rias is already it. Unless Millicas challenges Rias for the title, it doesn't matter, just like it didn't matter that Venelana didn't inherit the title either, despite being the oldest and the most powerful.

The devil hierarchy is not that strait foreward, Millicas is second in line purely because Rias hasn't had children yet. So, Millicas getting the title later has absolutely nothing to do with him being the "intended heir", Rias seems to have just given it to him because she wanted to, she didn't "have" to. So please, just let it drop, its not that complicated. We also know Millicas should have been heir, but his father left the title behind, so it doesn't matter.