No one thing wins a football game. However, one key result can determine an outcome. Against Oklahoma, the Alabama Crimson Tide will be motivated for a payback game. That motivation might be more powerful due to Oklahoma's post-game disrespect in Tuscaloosa. Neither will likely be enough to tip the scales in favor of the Crimson Tide.
One requirement for Alabama will be to maximize its defensive advantage over an only slightly better than average, Oklahoma offense. That will be harder to do in Norman than it was in Tuscaloosa. Another necessity for Alabama will be not to beat itself in special teams play.