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Did everyone just memoryhole the 2 1on1 collabs and several group collabs they've done together? The several times Mori has talked about getting along well with Kronii? How much Kronii gushed about Mori during her birthday stream? They've always been close, they just don't talk about it a lot on stream, and that's clearly manifesting now as an offcollab.
As for timing, it's not entirely out of the question that she wants to support her, but it's not like this is coming out of nowhere either. Take your meds