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I am not a physician, but I think, neither Rossi's or Pedrosa's shoulder injury is permanent. It is a common thing that the muscles surrounding the injured ones compensate for the lack of strength/athropied muscles.
This in turn will tire those muscle and amplify the pain and fatigue of those muscles. Since muscles can be trained and adapted, their muscles will soon get used to it.
So, either the injured muscles get better or the surrounding muscles get adapted to compensating the weak muscles. Of course, these things take time.