Straightening the knee is going to allow the hip to turn more . . . In both directions (backstroke and downstroke).
Nice one. As a youngster I used to have a saggy left knee (lots of leg drive) and try to spin the hips hard to keep them ahead of the hands to ward off a hook.
The legs and knees just anchor the swing now and have no action (although I personally try to throw a little left knee straightening in but not to fully straight. The hips have an action for some but do they ever actively spin through the shot? Is instant hip acceleration a slide in transition with a delayed hip turn?
If Im doing startdown waggles and hold the right hip back as I bump left and then go a little bit further in Downstroke with my only on my right shoulder the hips turn or are maybe turned.
Perhaps this is just a feel and not a real. Certainly better than spinning out.