@Kelsey Much to the chagrin of...well everyone I know...I have an annoying knack to play devil's advocate and take as much as I can at face value.
The devoted have said they want us to come with them all along. They have given us info to move forward. Why? I don't know, we're just guessing.
Reader says it's to leave us behind. Fine. That's what she says. I have no reason to doubt her. I have no reason to believe her. All I know is she said it.
All I know for sure is the devoted are angry at us right now. So yes, I agree we have to find what's out there first so that, in either their anger or their intent, they can't leave us behind.
Once we have what we want (the fragment), I see no real reason to deny them what they want as long as we are willing to work together. That's just my opinion.