At first, I thought I was neutral about this, but now I don't think it's a good idea for her to debut earlier. Especially when both albums (korean and japanese) come out; it'll be too much for her all at once. And let's not forget that areum needs time to get exposure too. While areum can receive some public attention as a new addition, then dani can join in december. Plus, she'd be getting more training, right?
I was neutral before, because she's in the new mv, so I figured maybe she could be included earlier. Being in the mv is already giving her some attention from what I see. Tbh, I think it would've been better if areum was in it since she's promoting with them now, but maybe ccm has good reasons for the choice.