User blog comment:B214/Question and Answers 6/@comment-50.139.232.230-20161016013521/@comment-1359322-20161016024902

Saying the same is an understatement. Rias is getting stronger too, and not just her everyone else is too. Just that compared to Issei, Yuuto, Gasper, Vali or Sairaorg, her growth isn't really obvious enough because it's being overshadowed by those people.