LAS VEGAS, Alta. — Sidney Crosby and Nathan MacKinnon were on the golf course. A chance to unplug after a busy NHL season, the conversation, of course, veered towards hockey. Line combinations, specifically. Attached at the hip each summer back home in Nova Scotia, the superstar duo — Crosby of the Pittsburgh Penguins and MacKinnon of the Colorado Avalanche — have only played meaningful games on the same side once in their careers. They will get another chance in February. The pair were among si