@BraceMaker yes, the videos @escmanaze posted are not demonstrative of the very best free skiers. The skiers in the videos would likely free ski the same whether they were on top of the line skis or traditional crossover skis. I think the main point was that they are skiers that try hard and want to push a ski to the edge.
The funny thing is that once a free skier develops enough skills such that they look better than the ones in the videos, they often seek out a course like @escmanaze did. As they get better in those early days of learning to run a course, are they now free skiers or course skiers? A guess it depends on what percentage of the time they get to ski in a course.
As an aside, when skiing in general was more popular back in the day, you could frequently encounter a free skier that had never run a course, but could link smooth low hard turns in proper form.