It is starting to look like Jim Rutherford was right.

Not long after his Pittsburgh Penguins were swept out of the 2019 Stanley Cup Playoffs, he defiantly proclaimed that the defense he had assembled was probably the best one his team had since he arrived in Pittsburgh. It seemed to be a rather dubious claim not only because of how the Penguins performed for much of the season (including the playoffs), but because he had also been the general manager for a back-to-back Stanley Cup champion in Pittsburgh.

But nearly two months into the 2019-20 season the Penguins have been one of the league’s stingiest teams defensively and that play is one of the biggest reasons they have been able to overcome a seemingly unending list of injuries to keep piling up points.

Just look at the defensive performance so far this season compared to the same date a year ago, as well as their final numbers from the 2018-19 season.

All numbers via Natural Stat Trick. The numbers in parenthesis are their league-wide rank.

They also boast one of the league’s best penalty killing units, not only in terms of success rate, but also in their ability to also limit shots and chances against.

The Penguins always had one elite defense pair in Kris Letang and Brian Dumoulin but everything after that was always a question.

So what all has changed?

The arrival of John Marino and development of Marcus Pettersson. One thing that should be pointed out about Rutherford’s “best defense” comment is that there have been some personnel changes on the blue line since then that helped the team get back closer to the winning identity it had lost. Erik Gudbranson and Olli Maatta were traded, while the team also made the under-the-radar acquisition of John Marino from the Edmonton Oilers in exchange for a sixth-round pick.

From the moment they acquired Marino, the Penguins seemed enamored with his potential. After watching him play for the past month-and-a-half it is not hard to see why. He has been a game-changer on the blue line and in his first pro season has already become a 20-minute per night player and has yet to look out of place. He brings some much-needed youth, mobility, and playmaking to a defense that badly needed all three.

Combine his presence with a full season of Marcus Pettersson (acquired in December of last year for Daniel Sprong) and suddenly the Penguins have two young, mobile defenders that can help drive play for what is currently a dirt cheap price against the salary cap. And both have the potential to continue getting better.

The forwards are helping more. One of the common themes throughout the Penguins’ offseason was that they needed to play “the right way,” and that the defensive deficiencies last season weren’t just about the defensemen themselves. They also needed more help from their forwards. They are getting that this season, and it’s not just because the returning players are playing smarter. The offseason additions of Brandon Tanev and Dominik Kahun, as well as getting a full season out of trade deadline acquisition Jared McCann, have brought three more fast, defensively responsible forwards to the lineup, and all are making significant contributions in every phase of the game.

Tanev’s signing drew harsh criticism (including from me) due to the term on the contract but so far he has proven to be everything the Penguins said he would be — a menace due to his speed and an always frustrating player for opponents to go up against. Combined with the arrival of young players Teddy Blueger and Sam Lafferty the Penguins injected a ton of speed, youth, and fresh blood into a lineup that the rest of the league had not only caught up to, but seemingly passed by the previous two years. With Phil Kessel and Arizona and Sidney Crosby currently sidelined the Penguins may not be as explosive offensively, but they are making up for that with their ability to shut teams down.

Better usage and a better identity. Mike Sullivan is turning in a Jack Adams level coaching performance this season and has pushed all of the right buttons so far. He has the team buying into how they need to play, they are back to play fast, and the personnel usage is far better (trusting Marino and Pettersson in big spots; playing Jack Johnson in the third-pairing/PK role he is best suited for).

Rutherford received his fair share of criticism the past couple of years (including from, again, me) and much of it was deserved. The team became too obsessed with “push-back” and getting more physical instead of getting faster and better. There was a constant revolving door of player transactions that made it seem like they didn’t really have a plan. Tom Wilson took up residence in their front office and seemed to drive every decision.

One of the most positive things anyone around Pittsburgh could always say about Rutherford is he is quick to admit his mistakes and move on. He definitely did that by making the team faster and getting it back to what it does best. It may not have been the most direct route, but for the first time in two years the Penguins have the look of the team that was winning Stanley Cups instead of the one that was getting swept in the first round. Better late than never.

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Adam Gretz is a writer for Pro Hockey Talk on NBC Sports. Drop him a line at phtblog@nbcsports.com or follow him on Twitter @AGretz.