The Penguins and superstar center Sidney Crosby have agreed to a contract worth $104.4 million over 12 years. The front-loaded deal, which takes effect for 2013-14, will average $8.7 million per season. Crosby, widely regarded as the NHL's best player, already has a Stanley Cup and a Hart Trophy as the league's MVP to his credit. But he has also sustained multiple concussions that sidelined him for the bulk of two seasons. Is it risky for the Penguins to set aside that much money for a player with a serious concussion history?