Hi Jim,
Yes, I write in many threads and sometimes I forget details. My point for the pics was, because I'm not able to palpate, to look for any sign of dysfunction: scapular winging, rhomboid dominance, lazy shoulder, pec minor dominance, excessive internal rotation, poor thoracic mobility or posture, etc.
Sometimes it will help a lot to look at the patients posture to determine if your thoughts are correct or not. In real life you got certain tools at your disposal, and on the internet not. Gotta make the best of it, right?
My advice for OP was solely tips to keep the humerus centrated in GF, nothing else. I wasn't disputing any of your information.
Rtc activation I consider two things, the actual muscle strength (manual muscle testing) and how the muscles fire during movement. For example, a strong serratus anterior still sometimes behaves dysfunction ally, when it releases the scapula early in eccentric shoulder flexion movements and allow it to depress. Or gluteus medius allowing the TFL to substitute.
My point: could be a strength issue, could be a motor control issue. Both will have to be assessed for a better diagnosis. If, say, the teres major or lats are substituting for a dysfunctional subscap for example, it won't matter if it's strong or not when it's not being activated in the movement. That's why I always teach my clients (especially the ones in pain) to lock their shoulderblades in.
Again, I haven't disputed any of your posts. Rather, I really enjoyed reading them and I learned some new things. I also referred to your posts in my explanation that you quoted. So I hope I didn't step on your feet or anything like that, doc.
This is my hobby by the way, I am here to learn and contribute, not to challenge or argue with anyone. So I hope my posts were perceived as just that.
Best regards to you doc,
Kjetil