VO might have a more dangerous shot, but Cozens does a bunch of other things that VO doesn't, the biggest impact he brings is movement. He's constantly attacking the net from the side wall which puts defenders in conflict. VO is stationary and extremely predictable.
From a pure numbers perspective, the top PP unit has been better in both chance generation and results than with VO:
[TABLE=collapse]
[TR]
[TD]Player 1[/TD]
[TD]Player 2[/TD]
[TD]Player 3[/TD]
[TD]Player 4[/TD]
[TD]TOI[/TD]
[TD]CF/60[/TD]
[TD]SF/60[/TD]
[TD]GF/60[/TD]
[TD]xGF/60[/TD]
[/TR]
[TR]
[TD]Dylan Cozens[/TD]
[TD]Rasmus Dahlin[/TD]
[TD]Tage Thompson[/TD]
[TD]w/o Victor Olofsson[/TD]
[TD]
59:28
[/TD]
[TD]
121.08
[/TD]
[TD]
71.64
[/TD]
[TD]
17.15
[/TD]
[TD]
8.67
[/TD]
[/TR]
[TR]
[TD]w/o Dylan Cozens[/TD]
[TD]Rasmus Dahlin[/TD]
[TD]Tage Thompson[/TD]
[TD]Victor Olofsson[/TD]
[TD]
18:47
[/TD]
[TD]
92.64
[/TD]
[TD]
70.28
[/TD]
[TD]
15.97
[/TD]
[TD]
8.13
[/TD]
[/TR]
[/TABLE]
It would be interesting to see some numbers on PP zone entries, I would assume that Cozens brings more to the table there as well.
Besides, he should have no trouble producing on a unit with Power, Quinn, Peterka, and Mitts, even if it's limited minutes.