Right now, it is difficult to argue against this. The defensive breakdowns have been glaring for a while now. I think they have the talent; I am just not sure they have the commitment. And I am convinced they have no clue how to cover the late man on the rush, as he is almost always all alone. They need to take these last two games and get back to playing well in their own zone and valuing the puck.
As for Zibanejad, I have said this for a while, watch the guy at even strength, and he does not shoot or even look at the net. I get very frustrated by that because I don't understand why Lavy doesn't say Mika you need to shoot more, or I am sitting you down for a bit to reflect. Instead, it is the same thing over and over again, and it is a trickle effect on everything else he does at even strength because when he is no threat to shoot it makes it so much easier on the D to cover the other guys and allows the goalie to be one-step ahead anticipating a pass. Fox is bad with regards to refusing to shoot or even look at the net, but he is a dman, it is way worse when your "# 1" C does not shoot at even strength.
Also, that line has not performed well. Roslovic has added very little, and Mika/CK only score on the PP. It is a big concern when your co # 1-line scores very little at even strength.
Lastly, not only has Roslovic been a dud so far IMO, but Wennberg also adds very little offense. I am not going to really get on him for two reasons though, he is the 3rd line C, so you aren't expecting major offensive production, and he does play solid in his own zone and is responsible defensively, so again he has been okay, and I am not going to be overly critical. With that said, he adds little offensively as mentioned, and he is an abysmal 44.7% on faceoffs with the Rangers, that is beyond bad, does he even try to win them.
With all that said, they still can right this ship. Need to play well and get back to being defensively sound these last two games, hopefully win them and win the East/Met (they still control their own destiny), and then go into the playoffs with some positive momentum. That is the focus right now from where I sit.