Haha, yup, i noticed it when the first time i watch the performance.

But i think it wasn't tegoshi nor ryo, but massu. Bcause in the chorus, massu's n tegoshi's voice were the most dominant, and i'm sure it wasn't tegoshi's voice, but massu's ;-).

U know what, if you watch the SC performance, then you will also notice koyama's wrong lip movement, hehe. I didn't remember at what times though, but it was at the "kanzen or kanjin" but his lips were saying "unmei", hehe.