[Loren]

The blue line is a little too high for Turned Shoulder Plane angle.
Usually it's drawn up through the armpit at address. (10-6-B)
The Standard (flat) backstroke shoulder turn component is meant to take it back to that line and then down it.
He's not far under it.
You have it on the Squared shoulder turn, a much steeper plane. (10-6-C)
Too much knees action, weight rolled to outside of left foot.
"Plant the left heel." Harvey Pennick, paraphrased.