lol I think Sakurai did it 'by force'
I know that for last year's Dream"A"live tour , they were singing Sakura Sake in the beginning & then they did so by suspension on top of the air with ropes alongside with the Dream"A"live balloon
I remembered when the guys went on MUSIC STATION last year , Sakurai mentioned about this & that he said it's either he go on top & sing the song with the rest or it's just him alone on the ground floor doing so LOL LOL
