With Joe Mixon not with the Oklahoma football team currently, and with police hoping to have their report filed to the DA late next week, perhaps this is a good time to revisit Dorial Green-Beckham. Remember him? The wide receiving phenom who showed up on the OU campus July 3 and officially joined team later that day? The Sooners brought Green-Beckham in to help him, given his troubles at Missouri, but also to play him. They’re trying to get him an NCAA eligibility waiver so he doesn’t have to sit out the 2014 season like most FBS transfers. The problem as of Wednesday night? OU hasn’t been able to file the waiver request because officials are waiting on one last bit of paperwork from Missouri. Green-Beckham’s former school has been cooperative with his new one generally, but now must help once more. The timeline is critical, given that the Sooners are ultimately at the NCAA’s mercy here.