Can be hard to follow resources and who is in what clique and why they're fighting.
You can see the roster (but not the cliques) by pressing C. It's a debugging feature, so it's not particularly nice and it's glitchy. But yeah, I agree that it's hard to follow individual castaways.
...some teens being left off the ending roster.
This happens to teens separated from the main group e.g. those who got lost. They are neither rescued nor confirmed dead.