Hey Tequila,
My perspective is totally the "Holiday Inn" variety so take with a grain of salt. But when you were describing the symptoms earlier, it screamed of what I have seen with too many players. And then, when you provided the diagnosis that included some version of frayed labrum, that was exactly what I expected to hear.
I'm sure there are varying degrees and types of frayed labrum injury. But, I have seen it happen too often... get prescribed with shut down or rest along with PT and re-examine. Then, quite often, surgical repair was eventually necessary. Meanwhile, several months to a year of time were wasted with the initial efforts of shut down and PT. It seems to be the common protocol. So, please keep doing what you are doing utilizing second opinions and seeing specialists so that you can get him on the road to recovery in a reasonable timeframe. I was very hesitant to throw this out as I don't want to send fear of surgery when it may not be necessary but I don't want to see another player lose unnecessary time.