>>33464484ID is the unity branch, and even early on ID1 basically treated Shien and Oga almost as genmates because they debuted so close to each other. So nobody really questions it when they do collab because they don’t ask for permission from chat first, they just treat it as normal brother and sister like interactions. ID2 and ID3 just continue from ID1 making it normal. To make a stink about it now would make people ask why they never had an issue with treerrat and Oga being best friends before. Some people do complain about Ollie, though that’s because she’s so passionate about brand unity that she actively calls out hypocrisy against the Stars.
On a similar note for EN, as much as Mori lives rent free in people’s heads here, she is NOT the EN people have whined about since Tempus debuted. This is because she interacted with the JP Stars and even did a song with one before, so she’s also just set it up as something perfectly normal. Baelz also interacted with Roberu and pizza dad beforehand and Mumei has been in group collabs that predate Tempus, and while some babies cried, it’s nothing compared to the levels that people are crying about Watson and Kronii.
tl;dr if you just do shit, stay consistent and don’t draw attention to drama, there will be no drama