Oh no I don't know anything about Kugaha and haven't watched the series. I just thought you could have given more of an explanation than "what he did to Bishamon's Regalias has qualified him to this" if you are going to add someone to CM you should explain what exactly they do and if there are any redeeming qualities, excuse or other mitigating factors.
I'm very bad at making reason so this is the only things I can explain so far.
First, he tells Suzuha, one of Bishamon's servant that he was forgotten by Bishamon and Tomoko, his old friend, crushing Suzuha to the point where he let himself gets eaten by Kugaha's wolf spirits. Second, the fifth episode in the second season of this anime shows that he summoned a monster to kill many of Bishamon's servant.