but working together I thought that's what a band was about...?
I bet the old guys felt the same way and that's why they are no longer in GNR. One thing is for sure, one member of that "band" doesn't have the right to hold the band hostage and demand a new direction of music, especially one who wasn't a major song writer in that band.
If you are looking for the succesful recipe for a unified band, dictation isnt in there anywhere.