Those factors would include:
1. The youth of the current Sooner team. I'm not sure how many 'ships they have to give away, but I'm pretty sure it's less than 25. Course, that shouldn't necessarily deter quality...even though today's blue chippers want to play as true freshmen.
The possibility of NCAA sanctions. I'm sure every team the Sooners face off against in the recruiting trenches is mentioning this possibility.
The recent struggles in the BCS games can't help. OU has been impressive in getting to the big games, but big game Bob has lost some of his luster in these contests.
Ranking recruits just seems like much ado about nothing. Or maybe that's just me.
Now, I'm taking away anything on recruiting at all. I think that is so vital for the success of a program. I just don't see the big deal about ranking them. (Then again, I get frustrated with weekly ranking polls too. Maybe I just want to see stuff played out.)