Love the forward corps, don't love the D, especially if Hanifin sticks in the NHL (which I wouldn't bet on, but who knows).
Up front, I'd have Matthews, Tuch, Milano, Garland, Larkin, Connor, and Dvorak as guys I'd have as locks. I like White, Bracco, and Tkachuk as options. Christian Fischer would be the ideal 4th line guy for a tourney like this. Boeser, Roslovic, Novak, Schmaltz, Bittner, McInnis, and Greenway are possibilities, but only Boeser really interests me there.
Tkachuk-Matthews-Garland
Tuch-Dvorak-Milano
Connor-Larkin-Bracco
Fischer-White-Boeser/whoever
That'd be my forwards. Tkachuk and Matthews work incredibly well together, and Garland is skilled enough to hang. A Connor-Larkin-Bracco line would be so ******* fast holy hell. Dvorak, I can't say I'm particularly familiar with, but I had a hole in between Tuch and Milano and as far as I know he'd fit. White is an excellent defensive player, and Fischer is too. Both quality scorers. If Tkachuk is judged not to be ready, Matthews and Connor also have some chemistry (played together at the U18 last year), and then put someone like Roslovic or Schmaltz on Larkin's wing.
My defense would be made up of some combo of Hanifin, Werenski, Carlo, Belpedio, Krys, and... Ugh. It's safe to say that if Hanifin isn't available, this defense blows chunks. I guess Collins or Dougherty or someone. Goaltending is also mediocre.