I'm interested to see what Hockey Canada does assuming that Dach is out. It's awkward to bring someone in late, but you don't want to handicap yourself if you don't need to and twice already Canada has had a forward get a match penalty. I have to assume that the team would add one of the forwards from camp, so Beck, Bolduc, Dumais, Greene, or Kidney. As Wheeler noted, Kidney is a good story but that should not be the deciding factor. Dumais also makes for a good story as a Halifax player, and it just so happens that he'll be back in Halifax tomorrow anyway since he played (3 points) in Sydney tonight. Beck is probably the closest player to Dach in terms of style and would probably be the one easiest to plug in on the depth lines. Greene sounds like he had a great camp, I somewhat doubt that they will go with an NCAA player though. Bolduc should not be considered after his bullshit.
I'd probably go with Beck to replace Dach since he can do the same things and that is what the coaching staff is going to want out of that player. A guy like Dumais has a higher ceiling in terms of what he brings, but it's hard to see a replacement player getting many chances beyond spot duty here and there and almost never a real offensive chance.