I think the Nutcracker 'Pas de Duex' is a fine piece for PAIRS, but not for a single skater. For Pairs, the music, with so many emotional buildups to a crescendo, is well suited to dramatic throws and lifts. For a single skater whose 'dramatic' moments are jumps and maybe the spiral, there are too many crescendos. If jumps are perfectly timed to the crescendos, fine, but if the skater has a fall or a misstep, it will be very obvious when the music and the choreography are out of sync.
Sasha seems to do this every year: use a piece of music another skater or team used last year (Shen/Zhao).