Well I know that a K-pop band can have 3-21 members in the band. But I know that J-hope, Rm, and Suga are like alike when it comes to singing/rapping and Jungkook,Taehyung, and Jimin are alike when it comes to singing. So that leaves out Jin which in my opinion, his voice is the best its just amazing and I think he should have been main singer!
I think they have seven members for a certain reason. When they were putting together a group they wanted a group where they speak to teens and write lyrics that everyone goes through in life. They found 7 members and they all are differant. But that's what makes them a family. They pushed each other to work harder and now they are as close as brothers.