Light/Short ski = harder to ride, Light/Short Dude = less muscle to compensate, Big Power = More difficult to control. Add it all up and it equals a lot of practice, earned skill and determination to progress. Light weight and big power add amplitude; almost any decently modded freestyle ski can do a decent barrel roll like this just not as must height off the water. The missing ingredient is skills.
I get a laugh at how everyone is a top ten pro freestyle if they had "that" ski.
1) I can ride a light/short ski fairly easy. I'm far from pro
2) Light/short dude = Less mass to rotate, Tighter center-of-gravity.
3) Big power tends to more of a light switch powerband. Yes, harder to control for recreation. Perfect for flatwater freestyle where you just constantly blip the throttle and then pin it for tricks. Guess it helps compensate for less muscle that light/short guys apparently have.
Those guys have tons of skill. I'm sure they started off on the low-power skis like most do and built their talent from there. Like I said, I'm not knocking their riding. Just pointing out that the hull/motor clearly helps. I definitely don't claim to be top ten anything, but I'm fairly confident that I could pull some flatwater rolls with that boat within a day of riding it. Hell, I do it with my SJ in the surf. Check out some videos on here. I've seen guys who can barely ride a stand up do flatwater backies on those types of hulls.