I skated with Holger some years ago in Deusto (north coast of Spain) and I would like to say one thing that I'm not really sure if you have understood. the thing is that his feet are positioned in a 45º angle over the plates. Its almost like side stance but with less pression for those who are not very elastic (sorry for my bad english). The rollerskates are really cool and maybe they can be useful for those who doesn't feel very comfortable skating side stance.
Another thing I would like to say. He is not the only one rollerskater who is still skating. I practice every week. rollerskating is more alive than it seems.
I love this forum.