I just lose a bit of respect for artists who find more interest in technical achievement than friendship / pushing boundaries with what you have. That band statement is a slap in the face.
I think that you really want to strive to be the best band that you can be. If that means letting go of a friend in search of a better musician, then you do what you need to do. If you wanna make a career in music, you have to do what's best for business.