I was just going through Natural Stat Trick for some TOI numbers .... Burns spent over double the time with the top line than he did the Hertl line over the last two games 5v5. Karlsson was the opposite. The last game it was pretty extreme - 11 minutes with the top line and the next highest forward was Sorensen with (Austin) 3:16. On the whole of the season Burns has over 100 minutes more with the top line than Hertl/Meier, whereas Karl is more spread even - just over 30 minutes between Meier (most) and Labanc (5th).
I guess that makes sense from watching all season. Karl gets more minutes with Hertl and Gambrell lines and Burns eats up a lot with the top line. I'd personally give Karlsson more time with the top line seeing as they are not just the best but most creative unit. Cool stuff though, numbers.