Idk how Yuna Kim came back, barely competed, and won Worlds by 20 points. Comparing it to Chan and Asada really puts things in perspective. Is it training? Strategy? Nerves? Technique?
Technique, Yuna is relying on her technique, just watch all her practice sessions at 2013 worlds and 2014 OG practice on Youtube. Yuna has absolutely total control of her jumps, totally relaxed upper body, even when she is nervous, or doubt about herself for coming back, or competition jitters, she can rely on her technique, as Yuna said herself after her bad warming up at SOCHI sp in interview, "I chose to trust my training". CBC OG Yuna FS commentary also mentioned that and summarized it very well (Yuna's FS at Sochi at that situation!).