As much as I'd like to see Quinton Hughes be able to play, he shouldn't be allowed to as it stands with regards to the injury status of our team. Canada was able to call up Harley as a contingency in case they dropped below 6 defensemen after the Shea Theodore injury. Harley was, however, not allowed to practice with the team. When Cale Makar was unable to play on Saturday night, Harley was allowed to play the game, because Makar being unable to play would have left Canada with only 5 defensemen. As it stands right now, barring further injury or illness, we still have 6 defensemen.
Also, despite the debate about it, I haven't seen anything about us asking if we could give Hughes the same treatment that Harley got and being denied permission. I also recall reading upthread that Hughes is still in Vancouver for the time being.