Great to hear the shoulder webinar helped with understanding how& why certain things are done.
With the trauma on the shoulder there is less of a buffer zone for less than ideal positioning. He may not be able to buffer things he was able to buffer in the past.
Positioning will remain even more important with everything he is performing.
Following his surgery it will be imperative to spend time with skill work and retooling everything that he is performing. Taking the time to build a solid foundation and improved foundation with positioning will prove very beneficial as he begins training again. Putting some time in with understanding and replicating the stable shoulder position will be beneficial as well.
Hope he has a great rest of the season.