LOL @ Vegas knows everything. You fellas obviously don't understand the rigged game Vegas plays. The entire odds making system is built around sentiment & the house advantage.
Here's what Vegas knows, when you win they pay you $100, when you lose they collect $110-120. The lines are not based on an analysis of the players, coaches or officials. The lines are based on the expected $ volume wagered on each participant given a spread. If Vegas thinks OU will win by 10 but their models, which are based on betting history, show that a line of Alabama -6.5 is most likely to produce equal amounts bet on either side, they put the line at Alabama -6.5. If more $ comes in on OU they slide the line down to 5 or whatever it takes to even out the book & ensure guaranteed profit.