I don’t know the man, though wish I did, but I put it down to the fact that his personality – troubled and of course bi-polar doesn’t naturally put him in the ‘team player’ camp.
From what I do know about him (his book, interviews nod endeavours) he is without question a man who has always and will always achieve far greater things on his own under his own terms. He is indeed a genius in my opinion and unashamedly not for this world.