Regarding DGB:
The new collective bargaining agreement for the NFL (the one that changed rookie contracts) IMO, will definitely play a part in this. I know the kid is a freak, but I just don't see him getting a 1st round grade after missing a year of football (and really only showing 1 year of good football at Mizzou). So, given that the money for the second round (and later) isn't what it used to be, he could very well play at OU next year.
Or
He decides to go anyway.