I guess it's up to your interpretation, but I'd also say it's worth remembering that Leanna and Ki-Ha are civilians, and they're also undergoing a very traumatic experience; they're not dealing with things as well as they could, for sure, and no-one on this ship is equipped to deal with the operative's trauma in any real way (you'd need a whole fleet of therapists for that).
Nash has... a lot going on haha, again, you'll find out more in coming chapters🙊 and as for getting IVI back, that's definitely the fastest way but it's not the only way. I'm certainly not writing it such that not choosing that option leads you by default into forgiving Rohan, or letting it go; hopefully, all available routes will contain equally interesting content👀
thanks again for taking the time to comment!<3