Hitting and pitching is very similar. Having an initial weight shift to the back side is good....how you get there is personal preference. You can get a good weight shift back with a zero stride (Pujos) or with a large dynamic stride (Harper). Same goes for pitching from the wind up....think Bob Gibson, or David Price.
The problem with instructing this without proper instruction is that players will get what I call "outside their leg", which loses the advantage we are trying to gain.
IMO style and athleticism is being coached out of our ball players by teaching instruction via teaching specific positions rather than how to effectively learn how to create explosive body movements specific to each individual players own unique attributes. Too many robotic looking hitters and pitchers out there.