I typically use this technique shown below for many shoulder conditions, but particularly status-post RTC. These are the circumstances where early PROM is efficacious; especially in external rotation and elevation. As you know, these individuals are typically very guarded with the humerus adducted and IR’d across torso (hence in a sling position).
This is adding art to a fairly un-artful and boring (yes, passive range is boring). You have to have a ‘little give and take’ though with the movement; meaning, you have to only apply the necessary glide posteriorly as the humeral head pushes into your hand. This may take a little time to get used to if you have only been using a longer level moment by pulling through the elbow. It is not quite defined as MWM I wouldn’t say as the purpose at this protective phase of rehabilitation is the same as you normally would want with MWM.
I get quicker results, better results, and more confidence from the patient from performing an arthrokinematic component to an osteokinematic approach. If you don’t already do this, give it a try. Let me know what you think!