To me it looks soooo reactive, you can just see how he puts and immediately gets back the force from the ground. It's hard to explain, and I don't think I'm that crazy to imagine stuff like this.
And yeah, he probably was lighter in the upperbody as well, and about 205 lbs (vs 225 now or like some years ago). He was a better one-leg jumper as well. But it's also been injuries slowing him down and making him wear like "armor" on his body...
I still don't get how he can jump in those shoes he's wearing.