I already know how this goes conversation goes because it's been had countless times before, but there is no usage gap that can make up the difference between Sanheim and Hagg. Quality of competition or a couple more zone starts each way (Hagg averaged about <2 more d-zone draws/game 5v5) doesn't make up for a 7% gap in xGF% or the canyon-sized gap between ~top 10 relxGF% among defenseman league-wide and ~bottom 10.
And Hagg's increased quality of competition, which wasn't as much as you think, came with an even more sizable difference in quality of teammate, which statistics show is even more important (and just common sense: good players playing with other good players against good players is preferable to good players playing with bad players). And what a difference there was playing with this team's top 6 versus bottom 6. The difference in xGF% QoC between Sanheim and Hagg was 0.36%. The difference in xGF% QoT was 2.2%. That's vast.
Compare each defenseman's CF% playing with each center on the team, in varied usage, and it isn't close:
| Sanheim | Hagg |
Couturier | 59.3% | 47.6% |
Patrick | 49.0% | 44.1% |
Filppula | 51.6% | 40.7% |
Laughton | 58.2% | 50.4% |
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