By tackling do you literally mean tackle or do you mean checking him?
I mean any kind of physical contact. Some guys are so smooth on the ice that you have to get physical and go for the body instead of the puck. This isn't the thread for this discussion and I do think Gretzky is one of the greatest but I don't think he would have gotten the stats if the opposition would have been allowed to grind him down. He isn't a big guy. And I think Orr is the greatest player ever