I think I found the answer to my question where CoachTodd says in this post
as "Leave the opposite arm ‘flopped out’ in the extended position while the recovering arm speared with the hip and shoulder drive that the shoulders rotate with this action. By keeping the opposite arm extended the shoulder rotation pulled my extended arm back rotating my humerus up and out pulling the elbow into the position that I had taught in isolation previously. From this position the hand and forearm easily dropped directly below the elbow resulting in an ELV automatically and naturally."
So the secret lies in the patient lead hand and hip rotation setting up the shoulder rotation for the catch.Will work on this.A special thank you to Coach Todd and others, for all the inputs given.