What would happen if these people made a sub-group together?

(I know it's not possible since Kibum isn't in SuJu right now, but it's an interesting thought.)

Name: Kim Ryeowook

Position: Main Vocalist

Name: Kim Kibum

Postition: Main Rapper, Vocalist

Name: Kim Taeyeon

Postition: Main Vocalist

Name: Kim Hyoyeon

Postition: Main Dancer, Vocalist

This is just an idea I came up with a few days ago. This sub-group be pretty interesting to watch, in my mind. :)