I see no argument that Malgin or Vatrano are better than Jamie Mcginn who is a physical third line veteran player. As a matter of fact neither were able to beat him for a spot last year and would not have this year either. The argument is not whether they are NHL players the argument is whether they are improvements over the previous ones.
1.26 P1/60, 50.88 CF%, 1.9 RelCF%, 54.35 GF%, 5.52 RelGF%, 48.87 xGF%, 2.38 RelxGF%
1.46 P1/60, 54.05 CF%, 2.4 RelCF%, 58.62 GF%, 6.45 RelGF%, 51.59 xGF%, 0.06 RelxGF%
1.22 P1/60, 46.17 CF%, -3.92RelCF%, 49.37 GF%, 1.02 RelGF%, 45.23 xGF%, -4.67 RelxGF%
The higher the better for all of these. Guess which one is McGinn?
Or we could try to compare their play when they were on the second line. They both spent more than 50 minutes of 5v5 with Huberdeau and Trocheck on the second line. Let's see how they fared.
53.65 CF%, 5.37 RelCF%, 53 GF%, 2.13 RelGF%, 50.3 xGF%, 4.16 RelxGF%
53.28 CF%, 0.73 RelCF%, 80 GF%, 34.17 RelGF%, 44.26 xGF%, -8.09 RelxGF%
43.63 CF%, -5.61 RelCF%, 40 GF%, -19.3 RelGF%, 43.74 xGF%, -9.08 RelxGF%
I'll give you a hint, the only time a line with Trocheck (that has played 50 minutes together) has a negative goal differential, it's when they are on a line with McGinn!!
Actually, that's also true for Huberdeau, McCann and Bjugstad! Wow, McGinn is so unlucky!
Now, I know that this is just stats. It's just the result of how they play together. But hopefully, you have an argument other than Boughner deciding that McGinn should start higher (than Malgin) in the lineup at the beginning of the season. Because otherwise, you'd have to argue that Vrbata was a better choice to play on the first line than Dadonov or Bjugstad, since Vrbata started there over either of them.