Yes we are talking about dysfunctional behavior to use an overused word. We are all dysfunctional some more than others. That's precisely why I would not anyone else's problems; I've got mine. We are also talking about ego. Entertain this thought. The Buddhists consider ego the manifestation of insecurity.
I just have a very hard time putting Thunders and Hell in the same artistic category as Monk and 'Trane. After all Monk was bebop's great composer and 'Trane , well he changed everything. Thunders and Hell to me are more like curiosities. And yes their drug problem was greater than their art. If I recall the standing joke was that Thunders only performed when he needed a fix or he was being threatened with eviction. He doesn't sound like a very committed artist. Does he?
Perhaps I know too many artists who are disciplined, hard working and passionately involved with their art.