>>97018561We know exactly how the process works anon, there have been so many girls that talked about it. Even just yesterday Koyori went in detail about how grateful she is to her manager for assuring production that her choreo would have enough energy to start off the show.
Bae talked about how long it took her to convince them to let her do that last year by the way. She fought for it tooth and nail and it wasn't sure she'd be allowed to do it until it was almost too late to practice for it so she had to grind hard at the very last minute and suffered from a huge crash overworking herself.
Also I'm not sure what you are referring to by sponsored stages to be honest.
For their own 3D Lives like Birthdays and what not the talents have a LOT more freedom and involvement, that's where you usually see the more crazy gimmicks like Marine living out her Showa fetish.
