Some of the elbo talk i did not like, i think teaching elbo jut is a teach that should be left alone in most cases and can promote a real bad upper cut swing.
I dont particularly like his balance at all in his demo swings, he gives himself a bit to much credit for having a perfect swing imo
A lot of swings he takes when discussing against shift-then-swing will tend to have a bias to the rear leg, but it is more for context of demonstrating than to say his swing is perfect. Also FWIW, he's no spring chicken anymore, that will have an effect too . IMO HI trained hitters come closer to a frame-by-frame match of the pros than any hitting system that I've ever seen.