Entering their second preseason game against Carolina on Friday night, Buffalo Bills offensive coordinator Brian Daboll is still experimenting with different groupings of offensive linemen and would not commit to naming a starting five yet, saying only that it was narrowed down to around seven players. With potential breakout running back Devin Singletary, an ancient and fragile backfield that includes LeSean McCoy and Frank Gore, as well as a second-year quarterback in Josh Allen who will need ...