User blog comment:B214/Question and Answers 6/@comment-82.2.190.195-20161026014255/@comment-202.80.212.167-20161026132212

It's actually plausible but for now Issei can only make his wyvern armor usable only for Rias. Maybe he can make a drone army of Wyvern armor in the future. I don't think he needs to reach another balance breaker to control Dividing fairy though. He only needs to order his dividing fairy to become an armor for someone with perfect compatibility, so yeah for now it's just a matter of compatibility