I'm still not convinced that the rule for touching the ball in the first 10 yds is awarding the ball to the receiving team regardless of who recovers it. Maybe it is in college rules, but I think it's a rekick after a penalty in the pros.
If Oklahoma did in fact recover the fumble before the whistle blew, it's a moot point. Oklahoma ball, no question.
Here are the only rules I could find for NCAA football. They're dated 2002 but I'm sure the rules haven't changed concerning free kicks.
http://www.ncaa.org/library/rules/2002/2002_football_rules.pdf
The pertinent section is found on page 79. I would copy but it's a pdf. In summary, receiving teams ball at spot of the foul.