User blog comment:B214/Question and Answers 6/@comment-207.242.44.6-20190114202428/@comment-10330822-20190130025739

Well, it might be interesting to not that Ex Gremory from EX uses Galatine III, and one could say he might live in the shadow of his older brother, Kurenai, even though Ex is considered an "ace", Kurenai is supposedly a Grigori research on Azazel's level.

Also, Le Fay and Issei's son is named Mordred, so it raises some interesting questions if the legend is talking more about DxD EX than DxD itself.