I remember a watching a kid who was technically proficient at long jump but couldn't jump as far as this other guy who had shitty form. The shitty jumper would make much more progress than the already proficient jumper. Although the proficient jumper would make gains through strength and speed work, etc... the kid with a natural jumping ability would see a much greater improvement, comparatively with skill work alone, and we haven't even talked about adding strength and what speed we can add. Although the proficient jumper really loved the sport, he'll never be as good as the shitty jumper.