Sure it is genetics? Maybe he just loves skiing.
With very few exceptions the best skiers at the local ski academy where I am from are the same that also spend most of their free time in the terrain park or trees.
The ones that were manipulated there by their parents but don't have a real love for skiing never get anywhere.
BTW, Racing weekends are pretty much a waste of time if you want to get a lot of practice.
Sure he loves skiing. But so do the rest of his teammates. The ones who didn't love skiing and were only there because of their parent's wishes dropped out of the program long before the U16 level. In fact, there are a number of boys on the team who got a lot more on snow time per week than he did. None of them could beat him in the course, and none of them could keep up with him in the trees and bumps either. He just plain looks and skis better than the other boys. If that is not being naturally suited for a sport, I don't know what is.
I'm not saying that genetics are the only thing. He is going to find that out at the academy level where pretty much everyone is going to have the same gift. I have spoken in length with him and his parents this summer that it is going to take a lot of hard work during the off seasons, on the hill, and in the classroom. If he goes somewhere with racing, that will be great, but his primary focus needs to be getting prepared academically for college and the rest of his life. However, that being said, genetics plays a huge role on how far a person can go in any sport. Most of us could have spent our entire life on the snow with world class coaching, and we would never make it to the top echelon of the sport.