Looking at Chaeyeon & Chaeryeong, neither of the two are superior or inferior to the other in terms of talent & star quality. They were always just as good as the other
Not to mention having two sisters debut together would’ve been cool
Maybe the pressure of both of them making it got to her, and she left for WM. That’s the conclusion I could come up with
After watching Girls Planet 999 with Liang Qiao & Liang Jiao being on together, I guess unlike most trainees who work to debut themselves, sibling trainees tend to aim for them to both make it or else one advancing over the other hurts them both
Chaeyeon is the big sis of the two, so she probably wanted to protect Chaeryeong’s chances I guess?
But yeah, def would’ve been cool if they had been together in the same team