Untouchabe? That is a little much. Yes good checkers are always needed. But so are stars that can take your team to the promised land. A team of stars isn't going to get it done, nor is aa team fo checkers. But there are packages where helm could be moved. But we are talking about picking up stars. If the pens were to offer us Staal for helm and others, I would do it in a heartbeat. No, I am not saying we can do that, but as an example it mkes the point.
You yourself just said you need that balance. I can't think of many players in the league in similar roles as Helm who can keep up with him. It's not just his speed, he's run entire plays by himself. In pressure situation he almost always makes the right play, and he has been known to draw three players to him and still keep possession down behind the opponent's goal. You can't easily replace that. He's not just a checker. He's a premiere checker in my book. Untouchable.