User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-71.108.70.155-20140123091839/@comment-1359322-20140124012716

Few things.

1st Who the Hell is Coa Coa, Serzechs and Finrir. >_>

2nd Serafall is the only person in the Sitri to have Ice-based Demonic Powers. The Sitris have Water-based Demonic Powers.

3rd Rias didn't based her move from Sirzechs' Ruin the Extinct, Extinguished Star is Rias' original move. She did ask Sirzechs for advice when creating the move but that's about all.