User blog comment:B214/Shin DxD 1 discussion/@comment-5.179.152.87-20180729072315/@comment-34061653-20180729111145

No one is saying that Rias losing to Issei is absolute but just giving the specs of both teams and how the plot is going, the chances and reasoning for Issei beating Rias is higher. Yes, it is Ishibumi story and he can do whatever he wants with it. No one is denying that but it doesn't seem likely that Rias will win. Especially when you consider that Rias has been sidelined in most of this arc so far.