User blog comment:B214/Volume 23 discussion blog/@comment-78.49.82.128-20170426022646/@comment-31137559-20170426230125

High School DxD Ex, Chapter 4: Crimson Will:

'''“No, she retired and ceded the seat of family head to my oji (uncle)… Milicas-niisama. Okaa-san now expands her business range into many different kinds of industry. We are also Rating Game players, although the game itself was discontinued during the war, after the invasion of the Evil Gods hit our world.” '''

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It just stated that she retired as head of the house and passed on the title of head over to Millicas. I don't remember where it said that she stepped down because Issei had a higher standing. And you can have a high standing and not be a Satan, you know? Issei is already considered a hero to the Underworld and is an important figure to the mythological world. That's a high standing right there. Zekram Bael had a very high standing and was he a Satan? And if Issei was a Satan then it would have been mentioned in Ex. But it wasn't.