Someone has to lose, right? Like Justin Timberlake was in N'Sync, and he's now successful. But what about the OTHER members of N'Sync? Must've been heartbreaking for them.
Miki is "good at this." Haruka isn't. Her days as an idol are numbered.
Isn't that what usually happens to idol groups? The successful ones stay; the unsuccessful ones don't. Sometimes everyone in the group fails (see Spice Girls).