Well, I'm glad that there are two more parts, because otherwise it doesn't make sense for it to end like it did. It looks like we won't get them any time soon.
So, maybe Nagato want the original and no dismanting one.
Yeah, what I don't understand is why Mutsu didn't reveal that she was the original? That's what's unnecessary here. But at this point knowing there's a continuation, then I'll wait however long it takes.
Most likely it's confidential information that she wasn't dismantled and has returned to being a normal person. Nagato did find her by accident anyway. I have the two other books, but no translations yet sorry.