User blog comment:B214/Shin DxD 1 discussion/@comment-79.69.201.127-20180714171743/@comment-28884330-20180714173530

Why would she? First of all there's nothing to say that Issei's Queen will necessarily be a strategist, especially judging by the quotes in the Shin Volume. This alone would leave Ravel with her position intact. And second, Ravel's worth is not only as Issei's strategist, she has much more than that as his managar and also the biggest real support he has. Your assumption has a lot of flaws with it.