I respect Opilion, he is far into the path of zealotry, but he still is true to his ideal, which is a commendable thing. He was really doing that to help Melie, keeping her as a soldier was second, this type of characterization is what makes this story so good.
I am still worried about Melie, this whole thing of her boxing her other personalities... will not be good in the long run, if her infection makes her personality be divided with enough stimuli it still doesn't mean those aren't part of her, more so when the "infection" is "arcane" in nature, common logic doesn't apply and that is considering that the mind is not a entirely logical thing.