Quote from MrPaul:
I'm in the same camp as you on this.
If for instance someone trades off Price and volume, simply identifies wholesale accumulation or distribution and trades the path of least resistance over years and years profitably, is it an edge or a skill?
Don't know what you trade. But the original argument was on edges in equities. In equities there have existed many small edges, many based on market structure and other weird things happening.
Changing the argument to futures, I think the concept of edge changes more to a statistical advantage...