User blog comment:B214/Shin DxD 1 discussion/@comment-95.210.189.106-20180720134150/@comment-86.145.211.146-20180720164729

Personally i'm not 100% sold on the Satan thing but It would make sense that all the Factions would give Issei symbolic Titiles to try to carry favor and build trust with a superpower able to defeat Gods.