I would like to think the reason Nys dominates this race is because he doesn't like it. It's his way of showing the course who's boss.
Also Francis Mourey has had back to back strong weekends. The French champion looked really good last weekend and was in contention for at least 37min of this race as well.
A good quote from Sven's post race interview:
"In the final lap the jump by Aernouts increased the speed of the leading group considerably. I climbed the Koppenberg on the big ring. In the bend I upped the speed a little more and I was gone, even though I had to dug in really deep. This really gives me a high", Sven said.