[MizunoJoe]

Yeah, the L elbow turn is a CCW movement of the whole upper arm from shoulder to elbow.

But actually, it helps add pressure to #4. When I turn my L elbow (whole upper arm bone actually), my L triceps "presses" into the side of my chest/torso/armpit. So it doesn't interfere with #4, in fact it helps a lot. I actually don't feel PP#4 much when I don't turn the L elbow.

Re #3 release as supination..movement of the forearm/wrist movement...moving the upper arm actually will move the elbow, which in turn moves the forearm, which in turn the wrist...it is just like painting but you are holding the paintbrush at the opposite end...turning the forearm or wrist itself is like holding the paintbrush near the brush...

So, let's ask a painter which one is better?...

What's better is to actually understand release of #3, and neither one of those is correct. The driving right shoulder moves the LFW off plane and the RFW on plane at Impact. The left shoulder, and entire left arm, including the elbow, should be inert. The left wrist can full roll(requires manipulation), half roll(happens naturally - no manipulation required), or unrolled(requires manipulation) , but that's Hinge Action, not #3 release.