Yeah, to me her upper body mechanics are optimized for speed and her total body posture is good for any spin but back spin. Nothing wrong with that. Just a different direction. Works for Ueno. If she was 10 would I change some things like a more aggressive stride and pelvic load/unload or maybe more of back tilt of the total body. Maybe. She probably had another five to ten percent there. But what she does is very fluid and efficient. I don't doubt she was/is very good.