The Olen Zellweger addition this summer by the Buffalo Sabres was the final piece to complete the blue line transition. Last season, the defense group was one reason for their success. The situation with Bo Byram forced them to break that group up after having one of the best top-four defenses in the league.

If you don’t recall, the Sabres acquired Zellweger from the Anaheim Ducks for the 45th overall pick in the 2026 NHL Draft (acquired in the Byram trade) and prospect Anton Wahlberg. The Sabres and the Canadian-born defenseman agreed to a three-year contract with a $3.1 million annual average value.

Byram Style Replacement

It’s easy to see why the Sabres targeted this player. His style is a perfect fit for the Sabres system, which requires their defensemen to be part of the play in all 200 feet of the rink. We’ve seen a few defenders who haven’t been able to skate or make a difference offensively not stick with Lindy Ruff.

Zellweger flies around the ice. He’s active in transition, not only carrying the puck but also joining the rush as the trailer. The 22-year-old has the skill set to be a shooter and a distributor in these situations.

In the offensive zone, Zellweger will be able to replace Byram in the high cycle that the Sabres used so often last season. He moves around the zone looking for space and lanes to open scoring chances for his team.

The microstats from All Three Zones track with what you see on tape. Zellweger grades out well in offensive contributions and transition.

The underlying numbers offensively align over the last two years as well. In Hockey Stats model, he has the second-best on-ice expected goals and on-ice actual goals for per hour rate Ducks defensemen. Zellweger led all Ducks defenders in goal differential at 5 on 5 over the last two years and was third in on-ice expected goal differential.

Everything here gives me confidence that, from a system perspective and in terms of offensive impact, the Sabres have made a solid bet with this move. I’m not going to dive into it with great detail because the second power play unit doesn’t get a lot of time during most games, but Zellweger can step into that spot as well.

In 138 minutes over the last two years on the power play, his on-ice numbers were decent with a 4.18 GF/60 and 6.71 xGF/60 rate. Both numbers were similar to what Byram posted during his time with the Sabres.

Elevated Responsibility

What will determine how successful this is moving forward is the type of player he can be in the defensive zone. He doesn’t need to be an above-average defenseman in his own zone. We all know Byram wasn’t that, but he needs to cut down on how often he makes poor decisions in the defensive zone.

There’s a reason that he had one of the highest expected goals against per 60 rates on the Ducks. That’s also a reason why he fell out of favor with Joel Quenneville at times during the season. He has been a high-event style of player throughout his career.

At times, when you watch him play, there’s a poor decision that gets him into trouble. However, what makes it frustrating is that later in the shift or a few shifts later, he makes a play with the puck that pops off the screen.

The clip is honestly one of the best examples of what I’m attempting to call out. It starts with a bad pinch and an odd-man rush the other way. Ends with a high-quality scoring opportunity back in the offensive zone.

That brings us back to the question of how he’ll look with more minutes and responsibility against a higher-quality opponent if he plays in the top four. Zellweger averaged 14:36 per game at 5-on-5 last season. For reference, Byram averaged 17:58.

The Sabres other blue line addition, Louis Crevier, averaged just under 15 minutes as well, but his usage was more difficult than what Zellweger faced with the Ducks. He received neutral deployment from a zone-start perspective, and as you can see below, wasn’t used in any high-leverage situations.

It’s one reason I can see Crevier starting in the top four out of the gate, ahead of Zellweger. He has a track record of handling more difficult minutes. Realistically, the two will probably rotate in the top four based on situational game states.

The Sabres are going to need to rely more on all three pairs instead of leaning heavily on the top four. I have a hard time making a solid argument that either Crevier or Zellweger can handle a deployment of upwards of 17 minutes a night at 5-on-5 right now.

I’m excited about the Zellweger acquisition. From a system perspective, I believe it’s a solid fit. At the same time, I anticipate some pain points that will likely spark debates about how impactful he is as an overall player.

Data via: All Three Zones, Hockeyviz, and Hockey Stats

Photo Credit: Gary A. Vasquez-Imagn Images