Comes back to what I said the other day. The problem is the thought that a 4th liner needs to be a grinder, responsible defensively, and any offense is a bonus. That's an archaic thought process. The 4th line is nothing different than the other 3 lines except the players are slightly worse. They can still shoot, they can still pass, they can still possess the puck they just won't be as good at is as the other guys. They don't need to be any more physical or better defensively. They're not going to be played in key defensive spots anyway. The 4th line is also a spot you can keep a specialist if you have one provided he is at least adequate at 5v5. By specialist I mean a guy who is great on faceoffs if you need someone to take a big one or a guy who is great in the shootout.