In various years, Mirai, Agnes or Christina also did not go to worlds at all and not always 4CC yet they got Grand Prix assignments, as did Caroline and Flatt. I think it is more bc Sam was injured at nationals and did not medal on JGP until last year I think. She is the same age as Mirai yet has significantly less senior experience. By not having last season on the senior Grand Prix, I think that probably hurt her. She might be doing better now if she had another year on the Grand Prix instead of being in juniors last year. She is skating well despite that, but she might be skating better if she had that experience.