Quote from Purple Barney:
So then your edge is your methodology, a set of rules, a strategy.
There are a ton of different methodologies out there regarding trading. And they all work. But for some people none of them work. Using the same methodology two people may yield completely different results. However using different methodolgies two people may find similar success. There is no end-all method or solution to the markets(i know you aren't saying that), the key to profitability(edge) is not in the method, but the man behind the method, and his mastery of the method, in conjunction with his mastery of his own mind(psychology). In other words, skill.
I have never argued any of these points. My only cause of concern for you is why you are even bothering with equities? You kind of took this edge discussion over the cliff.