Injuries are piling up for Oklahoma on the offensive line, with Branson Hickman arguably being the biggest. The SMU transfer started the season opener against Temple but suffered a sprained ankle has did not play against Houston. Center depth has deteriorated even further since, making Hickman’s eventual return all the more important. Brent Venables is “hopeful” Hickman is close to getting back on the field but as of Tuesday, there is not information. It’s not coach speak from the Oklahoma headman either, being honest about what he knows about his starting center. How bad the offensive line ha…