Byram is getting a lot of hype and talk. But I really wasn't 100% impressed with him at the World Juniors 1.5 months ago, let alone an Olympic team. Some people I watched the tournament with had the same conclusion.
He had a tendency to keep giving the puck away in the neutral-zone, which led to some odd-man rushes. It happened at least 2-3 times every game, but since it was happening against 18 year old Swiss or Slovakian players it didn't cost Canada.
It would cost them against Kucherov, Matthews, etc. though.