At Fix, your Right Elbow is Bent. IMHO, it's bent a fairly good amount. It's bent a little more at Release. So, if you start your Take-away from Fix, then it should Bend more.
Set you straight? You're already twenty years ahead of me. Hmm?, Twenty years to figure that out. I'm not the sharpest pencil in the box.
"I think that the fix amount of elbow bend, much like the right wrist degree of bend, is constant from the end of start-up until release. Of course the right wrist bend is not lost like the right elbow bend."
That's why I call it a "rigid Power Package". I'm trying to convey that there is a fixed degree of Elbow Bend during the Backstroke (end of Start-up) and Downstroke. Then, at Release, the Elbow, for a Swinger, is allowed to begin and continue to straighten until both arms are straight.
I can't get confirmation from others, yet in my own swing, it works perfectly by returning the right forearm to the exact Plane it was on at the end of start-up, except now, the Forearm is at Release.
Right wrist bend can be "fixed" but elbow bend can not. As a drill let your left arm hang below your shoulder then use your right hand to grab your left wrist. You will notice that your right wrist is bent. Now use your right arm to lift and lower your left arm "back, up, and in" across your chest. You will notice that your right wrist is fixed but your elbow will bend to top then straighten to follow through. This is the "magic of the right forearm".
Freezing the elbow is not advised for full motion shots.