Well, Tuffty, I agree with a lot of what you wrote, but... I wonder if the live shows were just as important a way to judge how popular different girls were.
At the live shows girls like Sayama Ai and Kasumi Kaho got cheers from the crowd just as big as the main 5 (Sayama, in particular, was a big favourite with the crowd).

I wonder if Sora had some kind of special contract that said that in any segment she must be featured first (e.g. Scatnews or the mock press conference thing they did). I'm not dumping on Sora, I'm just saying 'face-time' on the program wasn't necessarily based on popularity. Perhaps, there were other 'forces' at work. Like how much pressure the boys from Hokuto put on old Macaroni

to feature certain girls more than certain other girls.
I'm not saying the main 5 aren't very popular, their DVD sales prove how popular they are.

As a few people have written, some girls joined the muscats, stayed a few months, then disappeared, and you barely knew who they were. Why?
We'll probably never know.
Some girls got lots of 'face-time', some got a lot less...Hey, that's show biz!
I hope I haven't stepped on any toes.