Of course, neither of Jeremy's programs survived to Nationals in their original form. Both were altered (jumps/spins)so his back could make it through them. I think the long suffered most. More of the Jumps were changed. Spins were changed after the GP, then again the day before the SP when he found out one spin would not count, and replaced it with another. Someone wrote he accidentally skated the wrong spin by mistake in a practice session before the long.
So these were not the same programs he had been practicing earlier in the season. He had a lot to think about during the program, because muscle memory wasn't going to be there.
All in all, I thought he showed a lot of mental strength to get through that long in such a high stress setting as Nationals.
Yuka picked the music for the LP. He seems to do much better to music he chooses.
He's had ongoing back issues of one sort or another for a couple years now. Just not sure that can be fixed so he can skate like he used to. His physical capabilities have a limit now. I agree that his mind game has improved...it just happened when his body is giving out. Very, very sad.