The Colorado Avalanche has spent a large chunk of this season trying to outscore its goaltending problem. Mackenzie Blackwood made those issues look like a thing of the past in his Avs debut. Blackwood was stellar, particularly in the opening half of this one, and eventually Colorado’s high-end offensive players helped him out in a 5-2 victory Saturday night against the Nashville Predators at Ball Arena. “I thought he was outstanding,” Avs coach Jared Bednar said.