there are a lot of swing gurus teaching the same approach now and to youth kids. in fact my son has been working on some of these things over the last 18 months, barrel swivel and hinging of the rear hip. My son is 15 btw. 6"3 170. What I have seen is a lot more pwr in practice and in the cages and consistently hitting the ball hard. On the field he is struggling with timing, the swing is so much faster and more efficient that is he has not gotten used to waiting longer for the pitch to arrive, he is having to erase all of his early years of when he decides to start his swing, unfortunately as a freshman at a large high school, they mainly just hit in cages off the tee and there are not enough reps to get the timing correct, so have to work on it on our own.