User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-34061653-20190122110131/@comment-10330822-20190127200157

Then I see we are in agreement. As I said she's gotten quite a bit of development in this last arc after getting hardly any attention at all in the previous arcs.

Also, you are probably right about her not being the strongest of his wives, since we already have confirmation that Ingvild will be his wife too and she has Vali-level potential, which Rias cannot be said to have unless she uses Gasper.

Still, its not to take away from her. Sairaorg essentially uses Regulus the same way Rias is using Gasper/Aeon Balor. I know there is a third-party in there, but it doesn't really change the fact Rias is basically using Aeon Balor as her own.

That's what I meant by "preparations". It was kind of a colossal failure on Rias's part too. Just, "oh I have this technique that gives me super powerful clothes. Issei has a technique that destroys clothes and leaves the person vulernable. My clothes can regeneration, I'm fine". -_-

Honestly, that lack of foresight is not something I'd expect from Rias. True, Issei's Dress Break technique is powerful against her Balor Princess form, but at the same time, his Nyuutron Beam Cannon is far more dangerous. The minute they said he could get her clothes off, even for an instant, I knew the ending of that fight. And I wasn't wrong. Both Rias and Kiba's ultimate strategy was just attack with everything I got, I don't really see how that counts as "preparations and strategy" since its so obvious, and considering Issei is stronger than both of them combined.