Clearing left hip in the down swing - Leg flex question.
I know you have been working on how your hips move and clear and this latest post regarding your right knee seems to be part of what you are working on.
I would suggest that you are thinking too much on these swing mechanics and if not careful will be suffering from paralyses by analyses. I would further suggest that if you focused more of the output required, the inputs (swing mechanics) would tend to take care of themselves. Our brain has learned over time how to carry out certain actions so that we can achieve the physical objectives in the most efficient manner, allowing our bodies to utilise momentum for the best results. Actions like throwing a spear, ball, rock, swinging an axe etc come to mind. When doing this we don't focus on our hips weight shift, leg flex etc but more on the target, trajectory and distance, then let our brains work out the most efficient manner to propel the object.
I have heard before that the act of throwing a golf club down a field creates a fluid, effective golf swing without considering mechanics.
I had a sift through YouTube and found this one by Shaun Clements that explains this quite well. I hope it assists you:
[video=youtube;mhhxB6izKro]