The past 2012 NFL season got off to a shaky start when the replacement referees (brought in while the NFL negotiated with the usual starters) made some highly controversial (read: wrong) calls. And in 2013, two brothers go head to head, coaching the two playoff winners: The Ravens and 49ers. And both have their eyes on that coveted Superbowl title—what are the odds of that? Check out some of these NFL big shots—and a few future Hall of Famers—before they were stars…