Great Post

Personally and simply if I dont feel any coil up the inside of my right leg on my BS I know my legs have 'buckled'. Caused perhaps by a slide, over rotation of the hips, right knee straightening or whatever

If I have that tension built up in my right leg my lower body will naturally spring off it in the DS and my weight will get back to my left side. If not I pivot back around my right leg and pull/slice. There is in natural spring to get me back left. The problem I think many people have is they know they should get on that left side on the DS so they try and force that movement via some big lateral slide. Then they go way past the left leg usually with a wide open clubface

The thing to realise ( for me anyway) is if you build that resistance in the inside of the right leg and right knee and just turn your core(sternum) back through the ball then your lower body will get on the left leg (and post it up) naturally .. all by itself .. magically! This is why people say the DS just happens if they've coiled up right. Stable lower body, tension in the inside of the right leg and then just turn your upper body back through the ball

When that tension is there, the lower body has to move faster than the upper body

So the legs ... they need to be stable to allow that coil and I think people have to experiment with setups, stance width, feet positions etc to find their optimal stable position. This will of course differ with flexibility, strength, height etc but the key must be to feel that pinch in the inside of the right leg to allow your right foot to push off it naturally