Some under-the-radar players and factors that could play key roles in determining outcome of Super Bowl XLIX

Justin Britt is a rookie offensive tackle for the Seattle Seahawks, a player most fans know nothing about. Yet his play could determine the outcome of Super Bowl XLIX. A preview story for NBC's national websites: http://www.nbcnewyork.com/news/sports/Five-Key-Factors-That-Could-Determine-Outcome-of-Super-Bowl-XLIX-289867131.html