Wow. Thats pretty inflammatory there bud. I don't claim to be an expert, but I do think I know a good deal about these issues. I'm giving my opinion over a message board, and it certaintly isn't harmful. What did I recommend? Dynamically stretching those areas and ART. Are either of those going to cause a problem? No. I have a bachelors in Exercise Science and a CSCS, and I have no soft tissue degree or certification, everything I say I've tested on my clients and recommended they do the same, most make very good progress. Some have other problems different than I mention.
The subscapularis will also resist shoulder flexion when short. Is that not true? I also mention the teres major as a possible culprit. Is it not possible the teres major is tight? You know enough to know I could be correct about these issues, you just don't like the way I said it. Pec minor tightness and poor subscapularis quality are often found together.
I've done alot of close work with ART providers as I work with one and another is across the street. I also read alot, and have a solid understanding of these problems.
I understand if you dont think I'm qualified to be making these statements. My question to you is, are those issues I discussed possible problems looking at the pictures? I also don't agree with you about the discrepancy side to side, both shoulders have trouble entering full flexion, and the left side IS significantly worse. Another thing to think about. Though you are certified I imagine as a chiro or something, you haven't spent the time I have spent thinking about shoulder flexibility as it relates to reaching full flexion of that joint.
You say his pec minor is tight because something seems to be inhibiting his serratus? How about because his left shoulder is obviously higher in that one posterior pic, which often indicates a disfunctional shoulder and almost always pec minor tightness.
My helpful suggestion doesn't seem nearly as arrogant as your slanderous response. I'll admit you could be right and the subscap and teres major may not be an issue, if there is one issue it probably is pec minor. However, as I said before, I believe those other two muscles are possible culprits given the pictures, is that not possible, do the teres major and subscap not resist shoulder flexion/abduction when tight?