I know what you mean about the role of hands in dance. Since day one, I noticed that Ten seems to be aware about his entire body when he is dancing that every part of him is really engaged in the music and the movements. And not only his hands but his neck, his shoulders, his chin, his face, etc.. Plus he really does get into the character and the music it's like his entire being is in a STATE of DANCE. Like when others dance, I say they are doing the act of dancing but when Ten dances he himself becomes the dance. He is in the state of flow where there's no longer a distinction between him and dance. It's the most captivating thing.