I think it's normal to want to figure out what's going on. Everything that I've read about Narcissistic Personality Disorder, there's pretty much no way to know for sure whether or not an addict in active addiction has underlying NPD, or if they're simply the way they are due to the alcoholism. And the cure for those involved with people with NPD is the same as the cure for those involved with alcoholics -- focus on yourself and (re)building your own life, seek help, minimize or cut off exposure the person demonstrating the toxicity, etc.