@ Sunny being the least important member.

What kind of mess?
I love her, but I feel like the only member who if she left wouldn't make an impact on the group, would be Sooyoung. She's constantly out-shined by Hyoyeon and Yuri on the dancing side, and vocally she falls into the trinity with least lines. Plus, compared to Hyoyeon, there's less distinction in her voice setting her apart from the other girls with less lines. Plus, she's again out-shined by Yoona on a visual level. Sooyoung is one of my faves, but even I can admit if she was taken out of the picture nothing key would really be missing.
