The Nashville Predators’ decision to sign Colton Sissons to a seven-year contract earlier this week certainly raised a lot of eyebrows around the NHL.

As PHT’s James O’Brien argued immediately after the signing, the salary cap hit is pretty reasonable and it might even be a decent value right now.

But it’s the salary cap that puts every contract in the league under a microscope. Teams only have so much money to spend, and every dollar they spend on one player is a dollar they do not have to spend on another player. Every dollar counts, especially if you a contending team that is probably going to be spending close to the cap. Mistakes and misevaluations matter, and if you get caught with too many of them at once it can have a negative impact. Because of that, teams need to make sure they are using their limited amount of money in the most efficient way possible, properly prioritizing what matters and what doesn’t, and the players that are worth committing to.

Traditionally, teams have mostly avoided long-term commitments to players that are not top-line players. This is especially true among teams that win and go deep in the playoffs. I say “mostly avoided” because there have been several instances outside of Nashville where teams have given lengthy term to depth players. The New York Islanders signed forwards Casey Cizikas and Cal Clutterbuck to five-year deals, and third-pairing defender Scott Mayfield to a seven-year deal. The Detroit Red Wings have Justin Adbelkader and Darren Helm on five-plus year contracts. The Kings gave Kyle Clifford a five-year deal several years back. The Pittsburgh Penguins gave Brandon Tanev a six-year contract this summer to play in their bottom-six after giving Jack Johnson a five-year contract one year ago.

Those are just a few examples of players that are currently under contract.

The question, though, is why teams would ever want to do this.

The answer is simple: By giving the player more term and more individual long-term security, it brings the salary cap hit down a little and helps the team in the short-term. But is that extra savings worth the long-term commitment to a player that may not retain their value over the duration of the contract?

[ProHockeyTalk’s 2019 NHL free agency tracker]

One thing that has stood out about recent Stanley Cup winners and contenders is that pretty much none of them have had long-term commitments (five years or more) to players that played regularly outside of their top-six forwards or top-four defenders. It is practically unheard of. Identifying consistent lines and who is a “depth” player is a mostly inexact science. Coaches change line combinations constantly over the course of a season and a player’s role within a team can be a very fluid situation. For this, I simply tried to use even-strength usage as a way to identify a player’s spot in the lineup.

The table below shows the past six Stanley Cup winners and the players they had signed to contracts of five years or more in the years they won the Stanley Cup. Players highlighted in yellow were signed for six years (or more) at the time of the championship. Take a look at the names and see if you can identify a trend … they are almost all top-line players.

The only players on that table that were not either a starting goalie, a top-six forward, or a top-four defender are Olli Maatta with Pittsburgh in 2016-17 (he was top-four in 2015-16) and Mike Richards with Los Angeles in 2013-14 (he signed that contract in Philadelphia when he was a first-line center, and was a second-line center upon his arrival in Los Angeles in 2011-12).

I also looked at every team that made at least the Conference Finals in those seasons and found only five instances where a depth player was signed for more than five years. And even they have some asterisks next to them because they were at least signed with the intention of being more significant parts of their team.

• Alex Killorn, signed for seven years, was outside of Tampa Bay’s top-six during their 2017-18 Eastern Conference Final run, but was in its top-six during its runs in 2014-15 and 2015-16. When he was signed, the Lightning probably figured he was going to be more of a top-line player. He has since been surpassed by a wave of talent that came after him.
• Ryan Callahan also played third/fourth-line minutes for the Lightning during the 2017-18 playoffs but, like Killorn, played bigger roles in 2014-15 and 2016-17.
• The Sharks had defensemen Brenden Dillon signed for five years to play third-pairing minutes 2018-19 and 2015-16 during their postseason runs
• John Moore and David Backes (both signed for five years) were depth players on the 2018-19 Bruins.

Pretty much all of the Conference Finalists, and especially the Stanley Cup Finalists, over the past six full seasons had long-term investments in their stars and filled out their depth with younger, entry-level players and short-term veterans.

They were not giving out term to non-core players.

The problem with giving out term to depth players is that they can tend to be replaceable talents that may not maintain their current value throughout the duration of that term. You run the risk of that player regressing and not having the roster flexibility to bring in a cheaper and/or better player. If a star player ages and declines, they are still probably going to be giving you a solid return on that investment. The depth player may not, if they are even able to justify a roster spot.

Let’s take Sissons as an example. Right now he is a fine NHL player. Solid defensively, can chip in some offense, and plays a tough and often times thankless role within the Predators lineup. At around $3 million per year he is a fine investment … for now. Between the 2000-01 and 2012-13 seasons there were 14 players that were at a similar point in their development: Players that had played at least 140 games during the ages 24 and 25 seasons and averaged between 0.30 and 0.40 points per game, exactly where Sissons is right now.

Only five of those 14 players played an additional seven seasons in the NHL.

In professional sports dollars, an extra million or two over a couple of years is nothing more than a drop in the bucket to teams. But when the teams are limited by their leagues in what they can spend on players, little mistakes can quickly add up to big mistakes. The Penguins, for example, are now on the hook for $7 million over the next four years for the Johnson-Tanev duo, which is an egregious use of salary space for a contender pressed against the cap that is trying to get another Stanley Cup out of its Hall of Fame core over the next few years.

It is not just good teams, either. The Vancouver Canucks have spent the past two offseasons throwing big-money at the bottom of their roster and will enter this season with $12 million in salary cap space going to Antoine Roussel, Jay Beagle, and Tyler Myers for multiple years. The result of that is a bad team that only has $5 million in salary cap space and still needs to sign restricted free agent Brock Boeser. They are now in a position where they have to play hardball with their second-best player to get him signed, or have to make a desperation trade to clear salary cap space. It’s a headache that would have been easily avoidable had they not overspent on the bottom of their lineup.

As much as teams want cost certainty with their players and trying to secure their long-term salary cap outlook, it just doesn’t seem to make much sense to commit so many years to a player that isn’t going to be an impact player or a part of your core. The value probably will not remain, and it is going to limit what you are able to do in the future. There is not a third-or fourth-line player in the league right now that is so good at what they do that it is worth committing to it for five, six, or seven years. Age will eventually catch up to those players, and when they decline it is going to hit them even harder than the decline of a star.

Commit to your stars long-term because they can not easily be replaced.

The players around them usually can be.

More NHL Free Agency:
• Sissons, Predators agree to seven-year contract
• Predators being bold with term, but is it smart?
• NHL Free Agency: Most long-term contracts will end in trade or buyout

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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.