I am so happy that he got the two GP spots! Some GP fields are weak, so he may even have an outside chance to medal, depending on how things go, of course. He just needs the exposure and the experience right now. If he does reasonably well in the GP and the RN, he may even earn a worlds spot (but they have only two, right?)
Sima's case may be a little different. The Russian ladies field is so deep that I don't believe that she had any chance of making the world team. Yes, the GP/senior exposure would have been good for her, but may be she can win a Jr. GPF or Jr. Worlds and gets a stronger start to next season as a senior. There is no substitute for experience, however, and she may have to look at 2022 rather than 2018 at this point.