ST. PAUL — The night was supposed to be about Cole Hutson. The star defenseman made his ceremonious return to the lineup, scoring a goal and assisting on another to become the highest-scoring American blueliner in IIHF World Junior Championship history. Grand Casino Arena in St. Paul was rocking, especially when Ryker Lee tied the game with 93 seconds left in regulation to keep the Americans’ hopes for a 3-peat alive. But Finland had a redemption arc of its own. One year removed from losing the gold-medal game in overtime against the U.S. in Ottawa, the Finns avenged the gut-wrenching loss, and the winning goal came from an unlikely hero. Arttu Valila, an undrafted, 19-year-old,...