Oklahoma football: Dorial Green-Beckham officially joins Sooners, but many questions remain unanswered - Article Photos 9/9

Dorial Green-Beckham, center, celebrates after announcing that he will play college football for Missouri at a press conference in Springfield, Mo., Wednesday, Feb. 1, 2012. Green-Beckham, a senior wide receiver at Hillcrest High School, was widely considered one of the top recruits in the nation. (AP Photo/Mark Schiefelbein)