Thanks for that. The fact that it is my trail shoulder has allowed me to continue to golf for a couple years beyond what a lead shoulder would have. I cannot throw a ball overhand, put on a belt or sleep with my arm under my pillow, but I can still golf somewhat. Since external rotation of my trail shoulder is comprised, I do have too much lift / across the line in my current swing.
After reading too much about reverse shoulder replacement and the odds being pretty low getting back near scratch, I was discouraged. My shoulder is bad enough now, this year, for the first time in decades I did not play any USGA qualifiers. If there is evidence that there are those with a full reverse shoulder replacement who have maintained an index less than two or so, I will be encouraged. I have a follow-up appointment in August and will ask plenty of questions.