User blog comment:B214/Shin DxD 1 discussion/@comment-3965848-20180903064427/@comment-33341107-20180909141745

The point I think kai was making is that Issei and his team have beaten teams who use tactics and stratergy to bridge the gap in power. Rias' team is obiously more powerful then Sona's or Brakiel's but still weaker then Issei's so she will have to do that too