Boston's performance with and without Cowley in three seasons that he missed time to injury - 1938-39, 1941-42, 1943-44.
This is built off a post that
@overpass made several years ago. The original data was lost in the site migration, but NHL.com's new historical player game logs made it relatively easy to reconstruct (and with more accuracy than looking through old newspapers!)
1938-39
With Cowley
34 GP | 3.59GF/G | 1.74GA/G | 26-6-2
Without Cowley
14 GP | 2.43 GF/G | 1.21 GA/G | 10-4-0
The Bruins were ridiculously strong and deep this season. While they were slightly worse without Cowley, they were still very strong. Their scoring pace dropped off dramatically without Cowley but their defensive record improved.
Milt Schmidt missed several games during Cowley's time out of the lineup as well. Flash Hollet moved up from his defense/utility role to take a full-time spot at centre while Cowley was out.
After Cowley had returned from injury, with 16 games remaining in the season, Art Ross sent both Cowley's wingers, Ray Getliffe and Charlie Sand, to the minors. He stated he was unsatisfied with the defensive performance of the line. While both returned to Boston within two weeks, Roy Conacher and Mel Hill replaced them on Cowley's wings and they were even more offensively potent than the Getliffe-Cowley-Sand trio had been.
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In the playoffs, the Conacher-Cowley-Hill line tore it up. Cowley led the playoffs in scoring (for which he was awarded a Retroactive Conn Smythe), as the Conacher-Cowley-Hill line easily led the Bruins offense:
1938-39 Boston Bruins Roster and Statistics | Hockey-Reference.com (Cowley was injured and not much of a factor when the Bruins would win the Cup again in 1941, after his record-breaking Art Ross year).
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1941-42
With Cowley
28 GP | 3.36 GF/G | 2.18 GA/G | 18-7-3
Without Cowley
20 GP | 3.30 GF/G | 2.85 GA/G | 7-10-3
At the time of Cowley's injury in Januray, the Bruins were in first place in the league, but they dropped to third without him. Interesting that this year, it was mainly an increased number of goals-against that hurt them when Cowley wasn't in the lineup.
An complicating factor is that the Kraut Line left the Bruins to enlist in the RCAF near the end of this season. The Bruins were 3-6-1 without Cowley and the Krauts, and were 4-4-2 with the Krauts but without Cowley.
With Krauts, No Cowley
10 GP | 3.20 GF/G | 2.40 GA/G | 4-4-2
Without Krauts or Cowley
10 GP | 3.40 GF/G | 3.30 GA/G | 3-6-1
Even adjusting for the absence of the Krauts, it seems the Bruins' goals
against actually got noticeably worse without Cowley in the lineup.
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1943-44
With Cowley
36 GP | 4.86 GF/G | 5.33 GA/G | 15-16-5
Without Cowley
14 GP | 3.43 GF/G 48| 5.43 GA/G76 | 4-10-0
Yes, scoring really did increase that much during the war years.
Cowley was on pace to run away with his second Art Ross in the war-ravaged season, and Boston was holding their own as a team. Then Cowley went down to a knee injury in early January, and Boston went into a tailspin without him as they could no longer score at such a high rate. The Art Ross would eventually go to Cowley's linemate, Herb Cain, who only missed 1 game to Cowley's 14.
Herb Cain with Cowley
35 GP | 31-29-60 | 1.71 points-per-game
Herb Cain without Cowley
14 GP | 5-17-22 | 1. 57 points-per-game
After missing 11 games Cowley returned for a game, but he bumped his knee and missed the next 3 games. He returned for good after that but Boston's play did not improve. While they started scoring again, their goals against took a hit. Maybe Cowley had not fully recovered from his knee injury? In fact, Cowley did not perform as well in the remaining three seasons of his career and it's possible that he was never the same after the knee injury.
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In summary
- In all 3 seasons examined, the Bruins' winning record was better with Cowley in the lineup. The difference was small in 1938-39, when the Bruins were one of the most stacked teams in NHL history. But it was quite large in both 1941-42 and 1943-44.
- In all 3 seasons, the Bruins scored more goals-per-game with Cowley in the lineup. The difference was very large in 1938-39 and 1943-44.
- Surprisingly, for a player with a reputation for never backchecking, Cowley mostly seems to have held his own from a goals-against perspective. The Bruins' GA was significantly better in 1938-39 without Cowley in the lineup (but the difference wasn't nearly as great as the increase in GF Cowley brought). However, the team's GA was actually significantly worse without Cowley in the lineup in 1941-42. 1943-44 shows Cowley mostly holding his own, but broken down, Cowley seems to have had a positive impact on GA before his knee injury and a negative impact on GA after coming back from the injury. Maybe Cowley was right about the positive effects of his puck possession (at least when healthy)?
- As a side note, Cowley's effect at increasing his linemates' numbers shines through even though I wasn't initially looking for it. Cowley's new (at the time) line finished 1-2-3 in Bruins playoff scoring in 1939, and it was clearly Cowley driving the bus. Also, Herb Cain probably has his linemate Cowley (and his late season injury ) to thank for his Art Ross in 1943-44.