I feel like it's always been widely known that DeBrusk is a better fit with Miller than Pettersson, but that Pettersson just has greater need for him as a winger.
But yeah, the third line emerging really does us a lot of favors.
Honestly, and this might be unpopular, but if god forbid, Pettersson's disappearing act continues deep into the season, I would even be tempted to try this at points:
DeBrusk - Miller - Boeser
Joshua - Suter - Garland
Heinen - Blueger - Sherwood
Hoglander - Pettersson - Sprong/Raty/Lekkerimaki (ultra soft minutes)
If that top line is going to be put together, you really need them to be dominant, though.
C'mon bro