User blog comment:B214/High School DxD EX/@comment-201.239.133.207-20170104020556/@comment-30924344-20170105002237

I think Xenovian chose Quarta instead of Hyoudou because Griselda is family and Xenovia is Griseldas only family member so Xenovia would want to keep that family her and Griselda have through Zen.