The singer usually provides the personality for the band. If the band hates the singer, they find ways to undercut that aspect. The greatest players I know try there best to play in a way that promotes the overall musical moment and supports the personallity the singer is presenting. I guess thats the notion. They could all play in separate rooms and no-one need come to hear them if that were the case. Instrumentalists who have an axe to grind should play some type of music where the singer stays home. Otherwise they are a royal pain in the ass. All solos should be aimed at the moment of perfect understanding of any given piece. That is what bands are all about.