I have a question about あいつ in the following text. Who does it refers to? With この人 the author means クリストファー・ヴァルゼライド, so I guess it is ゼファー? Also it is unclear to me what is the author means by そう?
The reason why you feel unclear is that that's unclear. あいつ refers to someone other than those 4 persons. Isn't that mentioned previously or later, as same as what そう means?
Maybe it is my lack of understanding, however there are wasn't any mentioning about あいつ, maybe it will become clear later in the story...
Anyway, again thank you very much.