User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-73.244.39.60-20181115210530/@comment-33269657-20181118035338

I am not sure about Rias using Gallatine III though, because it just breaks the point. Rias said that both Issei and her can't master that weapon thus she will save them for her children. So she most probably won't use a half baked weapon.