The thing is, let's say you're a great songwriter but can only strum a little bit on acoustic guitar or something then let's say you're a brilliant guitarist but you can barely write two words that rhyme. The first case you could be Bob Dylan (and maybe he was a better player than I described but he certainly didn't flex any that muscle on most of his songs) and in the second case you're some unknown session musician. Ultimately Roger can survive on his own much better than David can. Roger can write songs, maybe play some of them, maybe hire some people who can play better than he to help him out. Dave on the other hand has been milking the same fucking catalog of Roger's songs for the last 20 years. I don't know about his new album but I'd say there are maybe 2.5 good songs (LTF only counts has half a song) between Dave's last two PF albums.