User blog comment:B214/Shin DxD 1 discussion/@comment-39.51.215.62-20180719200510/@comment-28884330-20180719214005

Ingvild is a much better choice than Grayfia, at least in this particular match-up. And since the team members can be changed, Issei could use Ingvild in this match, decimate Rias, and then use Grayfia in those match-ups with teams without dragons.