Regarding OCHA NORMA:
It's been almost 3 years since the KSS Unit was formed, 1 year since additional KSS were added, 7 months since their naming, and 6.5 months since the latest two members. It's been a 4 month hype train since their impending debut was announced, and they've been performing at every H!P-related event since then as promotion. At this point, people who are going to buy the release and go to their events are already going to do so. Announcing new members of other groups will not impact that. There are two weeks for people to fawn over new members and then focus on OCHA NORMA's debut. Besides, while it seems most fans are daredemo, there are those who focus on just one group or one member and won't care either way about ON's debut.