Alright, here is a complete mathematical breakdown of how would Oklahoma State pass Alabama for the #2 spot. There are a few givens for this situation:
Oklahoma State would move ahead of Alabama in two additional computer rankings, meaning they would be #2 in 4 of 6 (at least) while Alabama drops to #3 in 4 of 6.
Human voters only vote Oklahoma State & Alabama as either #2 or #3 (this is for mathematical simplicity, as it could very well not be true).
This is just one example, obviously more #2 votes than shown below in one human poll than the other could offset more #3 votes in the other.
40 of 115 members of Harris Poll must vote Oklahoma State #2
14 of 59 members of Coaches Poll must vote Oklahoma State #2
Would result in BCS average of .9411 for OSU, .9388 for 'Bama.
or for another example
15 of 115 members of Harris Poll must vote Oklahoma State #2
22 of 59 members of Coaches Poll must vote Oklahoma State #2
Would result in BCS average of .9400 for OSU, .9399 for 'Bama.
Obviously you can change up the numbers in a multitude of ways to get different variations of Oklahoma State pulling ahead.