Thread:B214/@comment-24098614-20150517003719/@comment-1359322-20150517022221

Once again, it has nothing to do with production cost, they wanted to increase the appearance for Irina and Rossweisse, something they can't do with Volume 5 because it was mainly on the Rating Game. Then in Volume 6, Irina was pretty much background only while Ross didn't appeared.

And Ishibumi was the one who agreed with this changes, so it is still within the author's approval.