Without injury, I don't think Gush is getting his shot in the top 6 to start the season.
Eklund-Celebrini-Toffoli
Granlund-Smith-Zetterlund
(or some combination of that sans injury)
Goodrow-Wennberg-Kunin
Grundstrom-Sturm-Dellandrea
Next up is probably still Kostin, THEN Gushchin, then Cardwell or Graf depending on the injury. Maybe Gush gets a shot before Kostin if Klim is still super inconsistent AND Gush is extremely consistent in practice and the last few preseason games.
If one of Smith or Celebrini is out, Wennberg will come up to 2C, Granlund will likely play 1C, OR, Granlund will swing into C and one of Kostin or Gushchin will slot in. It depends on how much Warso values a true shutdown line, thus whether to prioritize Wennberg for DZ starts / hard matchups.
If one of the wings is out, then likely Kostin or Gushchin get their chance. If it's a bottom 6 injury, then it's probably Kostin first and then Graf or Cardwell.
Unfortunately, there's no way that Goodrow and Kunin, both wearing A's at times, are going to be getting a lot of scratches.