User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-37165251-20181209183528/@comment-37165251-20181209205230

I personally think you are right that Hades, if he finds out about it, will try to use the Malebranche to his gain.

On the other Side Lord Nebiros is bound to House Lucifer, so Vali could bring him to help them if he becomes the new Maou Lucifer^^