The Leafs' D corps did not look good without Muzzin and Holl in the lineup. Alex Biega and Carl Dahlstrom simply could not replace them, not that that's a major surprise. Having their second pair back on the ice is nothing but good for the Maple Leafs. Muzzin likely won't see game action for another week, but seeing him skating is a good sign. Concussions are never easy to predict as far as timelines go, so fingers are crossed that his recovery continues to go smoothly.