my guess:
dallas top 3: vilardi heiskanen mittelstadt
avs top 3: heiskanen glass vilardi
if dallas takes vilardi, avs then drafts heiskanen leaving mittelstadt, glass and others for the canucks. I think canucks draft mittelstadt in this scenario.
if dallas takes heiskanen then avs drafts glass. That leaves vilardi mittelstadt and others like makar for the canucks to choose from.
Mittelstadt is most likely to be a canuck on draft day is my guess.