Interesting. My take was completely different.
Joshua is on a regular line at practice so presumably they're hoping he can go on Tuesday. Lekkerimaki has a higher cap hit than Bains or Aman so bringing him up to play with Joshua instead of Bains or Aman costs the team money. I see a good chance that Bains and Aman stay down for at least a game.
The Canucks only save the daily rate on $25,000 by bringing up Young in place of Silovs. My guess is that the plan is for Silovs to get a couple of AHL games in. If Demko can't go Tuesday then Young may back up Lankinen, but these moves make me think that the Canucks are expecting Demko is really close to getting into the lineup.