User blog comment:B214/Volume 23 discussion blog/@comment-172.56.17.58-20170417051436/@comment-31137559-20170419141756

@B214 Rightful heir is very subjective. To the Baels, Magdaran is the rightful heir because he has the Power of Destruction. While others will consider Sairaorg the rightful heir because he's older than Magdaran and is far stronger. Depends on how you look at it. Who you consider to be the 'rightful heir' doesn't mean that person is the heir. To you, Millicas is the rightful heir because he is the son of Sirzechs, who was the intended heir but became a Satan, losing that right. And the Satan's title aren't inherited, so Millicas took the name of Gremory. Let's just leave it at that.

And high-class pureblood devils are only allowed to marry pureblood high-class devils. Yet did that stop Issei from being married to Rias? Now I understand what a pureblood devil is. But Issei's a high-class devil now and is engaged to Rias and will be living in the Underworld as a devil. He is going to be a worldwide figure in the future so will the old devils really deny his son the right to be heir because he isn't purely devil and turn public opinion against them? They can't just do whatever they want. The Baels can't disown Sairaorg and take away his right of being heir because of how it will look if they disavow someone like Sairaorg who is of remarkable strength. They can't do that to Issei's son lest they turn public opinion against them. If it was an issue of being purely devil, then they shouldn't have allowed Issei to be engaged to a pureblood high-class devil who's the heir to her house. And yet even Zekram Bael accepts it. Probably Rias just stepped down as head to avoid an issue like that and all the headaches that would come of it.