No one is saying Miyahara was not "okay for her level" but the fact is that in competition, you are compared to your competitors, and in this case, many of them are more advanced in the presentation department than Miyahara. At this stage, be it age, coaching, choreography, lack of experience, or other factors, Miyahara is not using her music or expressing her choreography. Is that acceptable for a junior skater in her first season? Of course! Does that mean those flaws should be ignored? Absolutely not. I'm sure she will continue to grow and develop in this area, but in the meantime, she needs to be scored accurately for what she puts out on the ice. One poster in particular seems to think judges should score PCS differently for different age groups which is absolutely nuts.
Oh, and Re: Cesario being too "senior" for the JGP:

She has zilch experience in international competition and she's a TEENAGER.
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In all seriousness though, I'm glad the the officials running the Baltic Cup were accommodating enough to allow Sam access. It must have been difficult getting around the arena with her big, bulky walker. The USFSA also paid the travel for her live-in senior caregiver, I heard. And the fact that they let her use her walking stick on the ice during the competition is so progressive.