Torque.
Also he has too much muscle for his frame and that changes the balance.
Joints and spine are easily susceptible to stress injuries.
It’s similar to the little gymnast girls who lose their centers of gravity once the breasts grow. Short careers unless they a genetically small. Some of those commie countries could have been drugging those little girls to keep their breasts from developing thereby prolonging their time for athletic development and the resulting star quality performances that garnered them Olympic laurels.
Once little Nadia from Romania started to grow, it was all over.
OK. Interesting! I notice that Mary Lou Retton hit it big in the Olympics at age 16, then she was done after that.