"72% of the elastic energy restitution action comes from tendons, 28% - from contractile elements of muscles."
Author didn't seem to recommend the depth jump with the barbell.. but the reasoning didn't sound right, the reasoning was because the athlete did not jump as high.
I wonder how doing jump squats affect elastic energy restitution in muscles and tendons versus classic shock training with depth jumps.
From anecdotal experience, doing heavy jump squats improved my drop jumps, I felt like I could land from a greater height with more ease. But perhaps practicing drop jumps consistently could help with that too the same way. I didn't try that.