Honestly, if you have that kind of inside information that someone else may not have, while it may be legal to use, best practice should be for that person to not only keep the information to themselves, but also to sit out that playing. Of course, the honor system would have to come to play, and it would be completely unenforceable if said person chose to play, but fair play dictates that if you know something someone else doesn't, you should either (a) share with everyone and risk the game being cancelled, or (b) tell no one and sit the game out. Likewise, if only a few people get told, they should sit the game out in fairness too. There's plenty of opportunities to play; missing one game won't affect anything.
Just my two cents as former Host.