The Boston Bruins and their fans are likely still smarting from falling one win short of a Stanley Cup victory against the St. Louis Blues, but the bottom line is that this was an impressive run. Really, it cemented the notion that Bruins management has done a lot right in finding ways to extend this group’s window of contention, where other teams would age out of elite play.

Still, there was one thing that bothered me about the Bruins: their lack of experimentation toward the end of the regular season.

Most teams don’t get the chance to tinker without big consequences

For a long time, it was clear that the Bruins would meet the Toronto Maple Leafs in Round 1 of the 2019 Stanley Cup Playoffs. There was also plenty of advance notice that the Bruins were unlikely to slip from the second seed.

While other NHL teams can be dinged for a lack of experimentation as well, the Bruins (and Maple Leafs) were in a rare position in this age of parity: they basically knew where they were going to land in the playoff branches, and didn’t really face much of a threat of dropping out of their position for some time.

In other words, if the Bruins wanted to try a bunch of different things – treating the rest of the regular season as a virtual hockey science lab – they wouldn’t have faced severe consequences, even if those experimentations blew up in their faces in the form of losses.

Instead, the Bruins more or less played things out.

If there was one question I would’ve wanted answered if I were in Bruce Cassidy’s shoes,* it would be: “What if we broke up the line of Brad Marchand, Patrice Bergeron, and David Pastrnak?”

* – And, make no mistake about it, this would be a bad deal for the Bruins, because Cassidy is overall a very bright coach, and I’d struggle to keep a team under one Too Many Men on the Ice penalties per period.

[More: How will the Bruins look next season?]

Hitting a wall at the worst possible time

Overall, it’s fine that the Bruins leaned toward not messing with a good thing. For the most part, that trio absolutely caves in opponents with their mix of smart defensive play, blistering passing, and dangerous sniping.

Unfortunately, that group hit some serious roadblocks during the postseason, particularly as the St. Louis Blues’ defense found ways to short circuit that top line, and the Blues’ own best players feasted to a surprisingly lopsided degree. This tweet really captures how one-sided things often were during the 2019 Stanley Cup Final:

Yikes. Yikes.

While wear and tear cannot be ignored during the grind of a deep playoff run, it’s fair to ask if the Bruins didn’t have enough of a Plan B for if the top line sputtered. To some extent, you can understand why: because they basically never ran into that problem during the regular season.

Yet, lacking alternate options might have made the Bruins easier to “solve.” Consider this striking excerpt from the latest edition of Elliotte Friedman’s “31 Thoughts.”

When it came to the Patrice Bergeron/Brad Marchand/David Pastrnak line, one Blue said they were determined “not to be fooled by their deception.” Those three are excellent at creating havoc through the neutral zone via the different routes they take. The Blues focused on where they wanted to get to (especially Marchand’s and Pastrnak’s preferred one-timer locations) instead of how they got there.

Attached at the hip

The Bruins certainly provided the Blues and other opponents with a lot of “tape” on the top line, so to speak, as they kept them glued together during the regular season.

Via Natural Stat Trick, Patrice Bergeron played more than 729 minutes with Brad Marchand at even-strength during the regular season, while Bergeron was only away from Marchand for less than 46 minutes. David Pastrnak saw a little bit more time away from that duo, but still spent far more time with them.

It’s striking, actually, that Pastrnak spent almost as much time away from Bergeron and Marchand during the smaller sample of the playoffs (123:12 without Marchand, 134:07 without Bergeron, in 24 games) as Pastrnak spent away from them during the regular season (202 away from Marchand, 182:27 away from Bergeron), and injuries exaggerated those regular season numbers.

You could argue that Pastrnak was moved around because of desperation, rather than inspiration, during the postseason, as things weren’t clicking. So it wasn’t exactly as if those swaps were happening in ideal circumstances.

But what if the Bruins had more combinations in their back pocket?

Roads less taken

Cassidy had the luxury of finding out a little bit more about how other duos or trios might click, but he chose not to do so. Could Marchand and Bergeron really propel their own lines, and how much does Pastrnak need at least one of those guys to thrive? Might Marchand find chemistry with David Krejci, and could Bergeron really click with Jake DeBrusk? If the drop-off from spreading the wealth vs. going top-heavy was small, then the Bruins might have been able to throw different looks against the Blues, rather than playing into their hands.

So, with all of that in mind, how much should the Bruins consider breaking up the top line for 2019-20, or at least portions of 2019-20?

Interestingly, there might be a political element to consider, too: would they grumble at being broken up? In particular, it could be a tough sell to pitch that idea to Bergeron and Marchand, specifically.

Expanding Marchand’s even-strength minutes from 2015-16 to 2018-19 with Natural Stat Trick, the results are pretty comical. Marchand spent 2,461 minutes and 40 seconds with Bergeron during that time period, and just 368:46 without Bergeron. That’s the hockey equivalent of a common law marriage.

If there’s no argument for breaking up the veterans, then maybe continued experimentation with Pastrnak is in order. Theoretically, Bergeron and Marchand could carry a lesser linemate, as that’s the general pattern around the NHL, as teams just don’t often enjoy the option to load up with their three best forwards and still have some talent left over not to get bombarded when their other three lines are on the ice.

Consistency vs. versatility

Again, the Bruins have done an impressive job finding other players, and this post is mainly asking the question regarding whether they can get even better, or at least more versatile.

This interesting piece by Steve Conroy of the Boston Herald discusses David Krejci wanting a more stable partner on the right wing to go with Jake DeBrusk on the Bruins’ mostly effective, but occasionally hot-and-cold second line.

To be fair, Krejci wants stability, where I would argue that the Bruins should try a number of different looks:

“We did touch on that a little bit, but that’s not really something I can control,” Krejci said. “We have lots of good players here who can play on that side, so I’m not worried about that. We have lots of players. But what I would like to have is consistency of the lines so you create some chemistry. You always go through some ups and downs. Everyone does. But if you stay together as a line, in your difficult time of the year, the two other guys can lift you up, or the other way around.”

Conroy brings up some options as right-handed shooters, from Pastrnak to interesting young forward Karson Kuhlman. I’d also throw Charlie Coyle‘s name in the hat, as while he’s mostly served as third-line center for the Bruins, Coyle also played at RW at times during his Wild years.

The thing is, coaches do what Krejci doesn’t like, and get the line blender going for reasons. During an 82-game season, you’re going to experience streaks, but also injuries. You also must battle stagnancy and predictability.

But, really, finding different looks comes down to the playoff contests after the 82-game season.

***

Would the Bruins have won it all if they could have kept the Blues a bit more off balance? Maybe, maybe not. You could also argue that staying the course helped the Bruins get as far as they did, in the first place.

Either way, these are the questions the Bruins should grapple with, and experiments they should undergo more often than they did in 2018-19. Chances are, their cap situation won’t allow them to add much and will probably force them to lose a nice asset like Marcus Johansson, so it’s about getting the most out of what they already have.

Cassidy & Co. deserve credit for getting a whole lot out of this group, already, yet maybe there are a few more answers that simply haven’t been explored, or explored enough to truly know?

LOOKING BACK, AND AHEAD, FOR BRUINS

• Contract challenges heading into offseason.
• The lowdown on Zdeno Chara’s nasty jaw injuries.
• Marchand calls Game 7 loss the worst of his career.

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James O’Brien is a writer for Pro Hockey Talk on NBC Sports. Drop him a line at phtblog@nbcsports.com or follow him on Twitter @cyclelikesedins.