[Naoki shrugs.] I don't think it's a war. If it were, they wouldn't care so much about finding people who suit them.

[...Well, okay, ROSE kinda... chose poorly, for the most part, and from what Naoki knows her marking Armin was more out of necessity than anything. But he trusts Sun's word over hers any day.]

We don't know what they want, but that means we can't rule out the possibility they want replacements, or the chance they don't.