Baseball fans outside of St. Louis might not know the name Tommy Edman, but the starting second baseman and leadoff hitter is a critical player for the Cardinals in 2021. And he's the most known of a group that is under-the-radar but hugely important for the club. In this edition of Inside Pitch, Post-Dispatch sports columnists Ben Frederickson and Jeff Gordon prepare you for opening day by introducing you to the X-factors.