It would be interesting to see
DeBrusk - Pettersson - Garland
Joshua - Miller - Boeser
Heinen - Blueger - Sherwood
Hoglander - Suter - Sprong
and you could try swapping Garland and Boeser.
I'm guessing that their projected lineup right now for the start of the season is
DeBrusk - Pettersson - [Sprong/Hoglander/Heinen]
[Hoglander/Heinen] - Miller - Boeser
Joshua - Blueger - Garland
Sherwood - Suter - [Sprong/Heinen]
Assuming that Tocchet keeps Miller - Boeser and Joshua - Blueger - Garland married, and that the plan is to keep DeBrusk - Pettersson together and make it work, the other spots are up for grabs. Sprong will get a shot as the Kuzmenko replacement. Hoglander has to assert himself and impress Tocchet out of the gate to keep his spot in the top 6. Heinen, Suter and Sherwood allow for some flexibility.