I believe they are going to run Mcmichael-Cozens-Dach as the top line. They were way too good together. Either way you look at it, this team would a taking home gold and if not that is one of the biggest disappointments of all time

I'd say switch Zary with Perfetti, then switch Perfetti and Mercer

And have Holloway centre Newhook and Pelletier

I like those combinations but I've thought about the lines and think it should look something like:
McMichael - Cozens - Dach
Quinn - Byfield - Krebs
Holloway - Newhook - Pelletier/Mercer
Perfetti - Suzuki/Zary - Tomasino

I think Newhook-Holloway-Pelletier is your 4th line. I think they might go Zary-Dach-Tomasino though because I see no reason to keep Zary over a Beckman, Poulin, Jarvis, or Rees except for that line. If they used the super line I'd do

McMichael-Cozens-Dach
Krebs-Byfield-Quinn
Perfetti/Zary-Mercer-Tomasino
Newhook-Holloway-Pelletier
Suzuki-Zary/Perfetti