I once dated someone high up on the narcissism scale, if not a full blown narcissist (I think he was). He was not an alcoholic.
I researched it a lot at the time because, not having dealt with someone with NDP before, I really didn't understand what the heck his behaviour was about, I do now. I, personally, had to do this research because the whole thing caused a great deal of cognitive dissonance for me and that wouldn't rest until I figured it out.
We all have narcissistic qualities, there is a scale and everyone falls somewhere on it. There is healthy narcissism and unhealthy. So getting to a point where you could say, "he was/is a narcissist" is pretty much impossible, unless you have that training.
I don't know if that is helpful to you because, as mentioned, that could just be the alcoholism and the personality disorder and who knows what else.