Because she doesn't do that anymore?

And to be honest, her dancing has toned down a LOT if you saw it recently.

I voted for Kuu for energy (She has more energy than her own dancers sometimes), Namie (She makes the moves look so effortless and relaxed), and BoA for the obvious.

安室奈美恵

kuu kuu kuu kuu kuu kuu

Koda Kumi

BoA
Koda Kumi
Namie Amuro
Ayu (just cuz she has a lot of energy :heart)

Namie Amuro