I have no idea what you posted. Its just something with numbers on it no ones name either. Lets do the math on my formula for the this past year of Dumba and Soucy. Dumba had 21 points, a plus of 1, and 5 powerplay points in 1130.67 minutes of ice time. My projected plus per minute for Dumba is 0.015. Soucy had 17 points, plus 22, and zero powerplay points in only 758.5 for a net of plus 39. My projected plus per minute for Soucy is 0.514. If you were to multiply Soucy's projected plus per minute rate by the ice time Dumba had. It would translate into a net plus of 58 ( which would be way more goals for than against than Dumbas net of 17. So why give Dumba all of this ice time? Teams are rarely scoring when Soucy and Cole are on the ice and yet the Wild are still scoring with them on the ice.
Like I mentioned earlier, for whatever reason Soucy's gotten pretty lucky this year in terms of his goalies and his teammates' shooting percentages. Those things haven't been as much of a factor for Dumba.
I guess the one possible counterargument there would be that Soucy contributes to the goalies making more saves by playing better defense, which isn't unreasonable. But if that was the case I'd expect it to show up in the shot-quality metrics, and they really don't.
Shots against per 60
Dumba: 28.75
Soucy: 29.77
Scoring chances against per 60
Dumba: 23.42
Soucy: 24.17
High-danger chances against per 60
Dumba: 8.30
Soucy: 7.74
Expected goals against per 60
Dumba: 2.07
Soucy: 2.08
Source
There are some differences, but they're not wide and (if you put much stock in expected goals) they end up canceling each other out. So it seems like the +/- thing has more to do with the goalies than Dumba and Soucy themselves.
There's more of a gap when you look at the offensive side of things:
Shots for per 60
Dumba: 27.2
Soucy: 25.98
Scoring chances for per 60
Dumba: 23.49
Soucy: 20.56
High-danger chances for per 60
Dumba: 10.73
Soucy: 9.03
Expected goals for per 60
Dumba: 2.35
Soucy: 1.99
So the team generates more offensive pressure with Dumba on the ice, and their point totals being so close appears to mostly come down to luck. Even the quality of linemates and competition don't seem to make much of a difference based on what Dr Jan Itor posted earlier. The pairings get pretty even time with everyone and against everyone.