Woah, thanks for this! This actually strike my mind about how they debut, I don't have really idea about volleyball debuts, and even I witnessed SZ's debut, I totally don't have an idea that it was for volleyball support. I was enlightened by your three golden rules. *O*
There's no doubt about Iwahashi and Jinguji's debut I think, they are the shining juniors at this time. And yes, maybe Reia too! Well, they are into debuting large groups right now so it is most likely,
It's sad to break up 4-unit groups, but the 4-unit groups they are having have no final members and changes from time to time,
And somehow, I would like Johnny's to put up a stable junior group again just like Kisumai and KT, well, i would love that. everything comes quite randomly right now. Haha. ^^