I have never agreed with the GURU cause effect.
Remember the original observation was a video landmark occurring in high level swings made by Troy Slinkard the batman of Evergreen. GURU then called it bat drag.
Then GURU told his ex-disciples not to use his patented word.
Since he doesn't understand separation/xfactor (Epstein key to swing is "body torque"),it is impossible for him to find a fix that doesn't create the nonhighlevel hookspin pattern (linear calls this a "quick swing") all true disciples exhibit.
Epstein DOES have students who start off getting the back elbow ahead of the top hand when they take bat off deltoid and go hands free, but he also has students that do this and go on to a high level swing without "bat drag"/without exhibiting the video landmark.
With good loading, bat drag becomes a nonissue in many as trial and error learning proceeds.
The GURU must obsess about turning together and avoiding slop and stopping bat drag and stopping hip slide, etc. because his cause effect/root cause analysis is wrong. His instruction is then nothing but an exercise in compensation that makes learning the highlevel rotational patern unlikely.You can't fool mother nature and get a good coil focussing on the wrong parts of the swing.
These are not either the most direct things to focus on or even similar to the essential details of the high level swing. GURU instructions lead to wrong sequence. Let's take the 3 swings of the player in this thread, p. 5.
Both the tee swings show severe pushing from the back as opposed to initiating hips from front- see Yeager critique for more detail about the fiction of "vertical/pelvic loading".
Knees get closer together. Back knee turns before front knee.This sequence and lower body/thigh configuration are NOT a part of ANY high level swing, but kids are drilled on it over and over. This player still does not do this in the full swing on left, but push is still there and continued "progress" will risk making the full swing push even worse.This is no helpful kind of exaggeration,it's just a new/largely unrelated skill/extraneous stuff wasting learning time and making learning harder.
Fixing batdrag by adjusting posture and connecting and turning like heck and hooking the handpath just spinhooks the body,which is not the high level swing.
Lau knows the high level swing and how to ghet there too.Optimizing coil with a good positive move and pulling the knob and getting a good handpath extension sequence to stay connected (lead arm extension/top hand release) can also get you to the high level pattern which has no bat drag.
Since the cause effect is faulty,then, the guru can fix bat drag and still not get the high level swing.
Are you still obsessing about bat drag and hip slide ?
If so, Donny can help you out.
It is possible that you can add this stuff on later (See Garrett Retka's improvement in both batspeed and timing after using the LAu/Peavy cues after following guru instruction)
but I would not recommend taking that risk.