User blog comment:B214/Volume 22 spoilers/@comment-50.139.232.230-20161022060406/@comment-9595671-20161103052602

Yeah, Issei was present with Asia, Xenovia and Rossweisse when he helped save them, but Issei wouldn't have ever helped Gasper, Akeno, Koneko or Kiba if Rias hadn't found them all first.

So it's more accurate to say that for the four of them that Rias saved them, and Issei helped heal the remaining damage Rias wasn't able to herself.