I've read through about half of this thread and it's great information. I'm fortunate to have found stuff like this while just starting out so I can develop good habits. After watching myself swing in video... I felt something looked off. I would be rotating on both my front and back equally. No lateral movement. I finally saw it when comparing to pictures and videos of pros. Which led me here!
I understand the feeling and rhythm I need at the top of back swing. Where I feel as if I sink and drive my hips forward. I'm starting to get it but really want to understand the timing of the different alignment angles at different points during downswing. It just helps for me to visual the different angles of each major body part during each section of the swing and the most efficient, fluid way to move through each.
A4. Top of Backswing: This is when the hip drive begins. I think of it as a quick one-two count at the top, one as the final movement of the backswing, and two is the feeling of loading weight down over left foot, readying the slide.
A5: From all the pictures I see, you want your hips shifted laterally over the front foot AND the hips to be square at this position. However, when you start driving your hips laterally... there are two options to get to this position. 1. You can keep your hip angle closed and shift. I saw a video in this thread that depicted a wall behind you. To take that image, at A4, your back right pocket will be against the wall but not your left (i.e. closed). You can shift laterally while keeping your back right pocket on this wall and keeping your left pocket off. However, this feels a bit awkward (and exaggerated perhaps). It is difficult to then, after this lateral movement, rotate your hips square, with your left back pocket on the wall. You could instead: 2. Slide hips laterally WHILE squaring your hips. Not a rotation. Simply synchronizing the lateral shift of the hips and the squaring of your hips (both back pockets against wall)... to avoid the awkward cocked feeling when you laterally shift your hips but leave the closed angle. I feel as if the second option feels more natural, but I am only a beginner so want to make sure.
Also, to confirm, if that truly is the correct A5 position, then once hips are shifted and square, I would want my arms to be parallel with the front, wrists still cocked.
A6: With your weight loaded laterally over your left foot, which remains bent, you can now drive your right shoulder down. right knee forward towards left toe. I suppose the motion of your shoulder and right leg are the very beginnings of rotation, so hips are ever so slightly open. Additionally, right elbow stays tucked and wrists still cocked (if you are moving hips, shoulders, and hands ahead of the club, that lag should remain without trying).
A7: Impact. A continuation of A6, further rotation here. It was mentioned right knee moving towards left toe. Would it be correct to say that your right hip and right shoulder could feel to be moving in that direction? For instance, I saw a video where it was mentioned to imagine a clubface on your right shoulder (toe up) and you should imagine it hitting the ball squarely. I suppose the hip is starting to drive towards the target (i.e. pin) here. Additionally, the left arm is aligned with your torso and left leg, and since weight is shifted forward, that means in front of the ball (as are hands). Head stays BACK. So there is a slight arch from left foot through left leg through torso to head.
A8: Rotate through impact. Is this where the true rotation occurs? Do you keep right shoulder down (and head still) as long as possible while you continue to rotate hips? At what point do you allow yourself to start standing up and forward? Also, when do you release your hands and have right go over left? When at 45 degrees?
The hips transfer forward as they rotate. Most players have to feel more slide and less turn. I would suggest not getting too caught in some of the details right now and focus on these feels. If you focus and spend time doing these drills, the stuff you mention with rotation, lag, movement of the right shoulder will improve.