>>533630To be fair, this is a rat and it might be up to the talent.
Ame and Gura barely collaborate as it is. Kiara has some autistic Jap/Idol loyalty to the point where her own audience had to drag her for weeks, before she even considered allowing Holostars on Holotalk.
This leaves Ina and Mori. Ina doesn't have much time to stream, so the fact she did Pochi is a small miracle. Mori is the big unanswered questionmark, but it is in the realm of possibility that her collaborations were with people that are not compatible with the Hololive brand.