User blog comment:B214/Shin DxD 1 discussion/@comment-36663391-20181030085229

The difference of power between a low-class god and a satan should be greater than that between a ultimate class devil and a high-class devil. This make Diehauser feats very incredibile, but if Hades have see is match he could tell to Balbeirth of be the Zeno's bodyguard for all of match's time when Verrine, Sonneillon and Gressil figths the members of Diehauser's peerage. My other reason why both Diehauser and Rias should lose is because Balberith believe that Issei can be his father and this could be important for the plot in future.