All this is just fart gas at this point.
Where the rubber will meet the room is when Coppy goes to court....or, he doesn't.
If he was the "lone gunman" plus a henchman or two, and everyone is comfortable with that, then Coppy will get his day in court and no one will care and he will be a very sad little nerdy puppy who never works in baseball again.
If he drops the lawsuit in favor of a settlement, then he likely has the goods on Hart and JS, at least enough to make things unpleasant, and he never works in baseball again but at least gets enough cash out of the deal not to worry too much about it.
Either way, Coppy is done in baseball. If he gets his cash others knew. If he gets nothing others still probably knew but he can't prove it.