If you ask most idols, they would most likely prefer to be the most popular member from a lesser known group, than the least popular member in a popular group.
At least they have individual schedules and actual work rather than just sitting at home and dorms while the actual popular members are promoting everywhere on TV. And this also leads to work after the group disbands or have an infinite hiatus.
Just look at idols like Uee, Nana, Sejeong, Yeonwoo, Eunwoo or April Naeun before her scandal. They have all established their careers one way or another and often still stay in the public's spotlight, meanwhile for other least popular members in a popular group, they may promote on TV once in a while, but a lot of times don't do much at all and still gets no buzz.