Gardiner and Carrick were really good together in 16/17, and with Babcock's preference to pair LHD with RHD, I expect him to get more ice-time this season (especially since, looking at the value of the contract he signed, management appears to believe in him). Gardiner and Zaitsev, meanwhile, were not so good together. They need to be split up.
What I expect for to start the season is something like:
Rielly-Hainsey
Gardiner-Carrick/Marincin
Dermott-Zaitsev
Marincin/Carrick
I agree with Frank on Holl - I think he's getting a little overvalued around here. To me, he seems to be more of a 6/7 at the NHL level, but a good top 4 guy for the Marlies, and I think management will prioritize his help in developing other pieces than having him play an inconsequential role on the big team. They may do the same for Marincin, but I can see Babcock wanting to keep him around as a sort of Polak replacement.