The thing is, all these musicians Mark plays with in his solo career are chosen by him, be that because he likes the person, or because he likes their playing or any other number of reasons, it doesn't matter if they are great or not, they must like Mark's songs or they wouldn't be working with him for so long, both Richard and Glenn have stated that working with Mark has been a high point in their careers, if that's not an endorsement I don't know what is, they are session players with decades or work, with many, many people, so, I believe them, Emmylou and Chet both have said highly complimentary things about Mark too, as always, there are 2 sides to the story, and we really don't don't know what either of them are!!! We can't all get on with everyone we meet or work with, or even related to, that's just life.