I believe that moreless had become what he is long before he came to CZ. The way people interacted with him on curezone did not create his narcissism, but it certainly fed it. He fed his ego by belittling others, and by bullying and intimidation. He needs professional psychological help, and maybe this break will encourage him to seek it. Those who tolerated his excesses without saying anything, or making excuses for his behaviour, also fed his ego, by allowing him to think he was above reproach, and that he could continue getting away with what he was doing.
What we become and how we behave, is not down to how others treat us, it is our sole responsibility. As human beings we all have the ability to change, we may just lack the skills to know how to do this. Those that truely want to change will seek out help in order to learn these skills.