this, the artist sell the song not reverse, especially for idols, you'll need a viral hit like Rollin to be carried by the song alone, obvious song matters in long run too, if they like the song, it will have great longevity but it started doing good because of the group, they wouldn't bother to check it if it was another group
Not sure if I fully agree. Yes, Yujin & Wonyoung Are an important factor, but why would IZ*ONE not have had bigger hits if that is the case, since ELEVEN performed better than any IZ*ONE song?