Pa, where does 2022 play when he is brought up? And, does he play ss for his travel team? Assuming he stays on the same track with his progression and talent, he will likely be the V ss junior and senior year, right? I don't think that is an unusual path, even for very talented players, in a good program for a variety of reasons - even if more talented than the guy in front of them. So, how he handles things meanwhile is very important (maintaining good attitude and team focus, even toward the coach's son). Very good lessons for next level and other life-related scenarios.
Another glass-half-full thing to note is that he is being moved back and forth so sounds like they are at least making sure he continues to get game reps somewhere.
Side note... Meanwhile, If 2022 continues to gain ground on coach son, at some point in the next year and a half, coach will hear/feel pressure to react. He may or may not do so but things do change. That pressure will be applied from other sources. Definitely something you want to stay clear of.
PS - regarding your question as to whether the other players or coaches should bring this up... keep in mind, they are in a very tough spot too... how do they, in effect, say something negative about the boss' son to the boss? The pressure will likely come from elsewhere or by accident (coach overhears player rumblings). An asst. coach would have to be a very astute diplomat to navigate those waters.