Just to clear up, I'm not talking about the other players who may of later joined we are talking about Mathew Johns only.
So why does Johns cop it and Warnie doesn't?
Johns cops it because... he and Firman should not have allowed anyone else into the room, end of story.
She naively gave her consent to go back to a room with two guys, which is clearly different to expecting another four different guys to have sexual contact with you, while another five or however many were let into the room to stand around and nakedly watch and get off on it.
To have let other people into the room, and allowed them to stay there is for Johns and Firman to breach the understanding of consent between the parties at the point where she agreed to and came into the room with just two others. Think about what you'd do when someone walks in on you when you're in the middle of consenusal sex with someone (or even two other people) - you'd yell at them to get out of the room, and usually they would happily do so.
But not in this case, where with reports of the signals of the curtain and the bathroom window and the eager participation of ten others, it may well appear to have been a planned group activity, not fully discussed with one of the parties upfront? That's why Johns apparently said sorry to her afterwards - that's why it's different to Warne cheating on his wife, and that's why Johns is (rightly imo) now being stood down from involvement with the game.
Gotta love rugby league culture sometimes... :?