Over the past few years, Trent Frederic has shuffled in and out of the Bruins lineup. Coming into this season, Frederic was looking to earn a permanent spot. Through Boston’s first five games, the St. Louis native has been a key piece for Boston and made it hard for Bruce Cassidy to take him out of the lineup. While the season is only a week old, Frederic is making the most of his latest opportunity. Through five games this season, Frederic has one assist and has landed six shots on net. The St. Louis native has not been lighting up the stat sheet but he has been affecting games in other ways….