To a certain degree, great artists are allowed to get away with behaviour that wouldn't be tolerated in lesser mortals. It is said that Davy started taking drugs because his jazz heroes had gone down that road - always with very bad results, as it happens. Yardbird, Coltrane, Miles, and Chet have all given vert poor performances because of drugs. I would have hated to have recommended to a friend that they go and see Davy, and then have him, Davy, deliver a dreadful performance. I love Davy and a places he has taken me musically. He was/is indeed a complete guitarist in a way that Bert never was, but he needs help. Lots of it.