Quoting: Pensfan89
I understand the game just fine. What you don’t seem to understand is that the number 1 priority of a defenseman is to defend. And offensive defenseman and two way defenseman does have a goal in generating offense in the offensive zone. Not so much for a defensive defenseman. They are supposed to stay back while their counterpart pinches and generates offense. Hence why guys like Dumoulin, JJ, Gudbranson, etc don’t really do too much in the offensive zone.
Great, and someone like Jack Johnson doesn't defend well, help get the puck out of the defensive zone or help in the offensive zone. You think that just because he doesn't score, he's useful elsewhere. That's wrong.
The fact fact that you think Dumoulin is even comparable is what makes me think you have zero understanding of what a good "defensive defensemen" can do. Dumoulin can get the puck out of his zone. Can make passes in the neutral zone, and can help continue possession in the offensive zone by keeping the puck in, making good passes, and not getting his shots needlessly blocked. He doesn't rack up points. But he has a positive impact. Johnson does none of those things. Just because he doesn't score, doesn't mean he's doing anything else well either.
"They are supposed to stay back while their counterpart pinches and generates offense"
You really have zero idea what you are talking about. They do a whole lot more than that. You also seem to think that "pinching" is the only thing that D men do in the offensive zone to help the team offensively.
Dumoulin: Doesn't score but does a lot of things well.
Johnson: Doesn't score and does nothing else well.
Not the same thing.