You are overthinking the hell out of this. Yes, some jumps build reactive strength and all jumps build explosive strength. Using a box to squat also builds reactive strength, reversal strength, and speed strength. Are jumps better or worse than than box squats? There is no way on earth to tell because the difference in weaknesses will be very specific to the needs of the athlete and what the goal of training is. Obviously for powerlifting, the athlete competes in the squat bench and deadlift. So dynamic squatting is a must. But, MANY very strong powerlifters use jumps and sprints as well to build their squats and deadlifts. Just like how many good athletes use dynamic squats to get ready for their sport. To say one or the other is better or should be the only modality used to prepare for team sports or powerlifting would not be smart programming.
Plus, most of westsides guys do some kind of jump training:
Dave Hoff (2905 total at 275) and Brandon Lilly start box jumping at 4:05:
