At the end I started to genuinely wonder whether he was suffering from quite a profound mental illness. Plus he never seemed to get good advice or support from his 'inner circle'. At least the club did their best to support him but he could never seem to help himself. Not one of the clubs he played for looks on him with any real affection despite some amazing performances.
I think he'll look back on the last years of his career with genuine sadness. What a waste of talent.
I think you're spot on. He has been a pain in the arse wherever he has been but there are some, pretty strong, underlying issues which, as I said earlier, I hope he can sort.