[It was strange to him as to how Rei and Kaworu seem all too willing to reveal things about their lives. Are those things not considered confidential? Are they not familiar with the notion of Black Mail?
Nonetheless, they make for conversation fodder. Lightly~]
That would be "removing" an element of an Angel's function, but Acumen seems to have underlined "replacement" -- perhaps it would have replaced the need with some other function; like protect all things living, perhaps?