User blog comment:B214/Volume 23 discussion blog/@comment-1884090-20170408001538/@comment-31137559-20170410185721

Well you really can't get on Issei for that considering that Rias has faced the same problems. You don't know what's going to happen in a Rating Game, no matter how much you prepare. Creating a countermeasure for their weaknesses is easier said than done. We saw during the Gremory vs Sitri match and the Gremory vs Bael match how Rias didn't know or anticipate what would happen. Sona basically put her into a corner. Tactics would be worthless if everyone could easily see through it. And then with Rias' match against Sairaorg, she never anticipated that Sairaorg's servants could have gained new abilities. And then Rias and her team underestimated Kuisha's Hole ability despite seeing her using it in the Glasya-Labolas match.

There are some things you can't counter against. Most females can't counter Issei's Dress Break or Bilingual. Most people can't counter Diehauser Belial's Worthlessness. Tactics wouldn't work if people could see through them. We have to remember that Issei's team and Rias' team are power-oriented. While they do have some techniques, their strategy revolves around power and very few tactics.