I honestly don't think that this call was as cut and dry as you guys are making it out to be. I think it could have gone either way and when calls are like that, I always expect them to support the call on the field. That's why I wasn't surprised with the outcome.
I don't have the video, so I can only comment on what I remember seeing live. The Oklahoma player obviously lost possession of the ball before his knee touched the ground. I don't believe anybody is disputing that. However, after his knee touched the ground, he wedged the ball between his arm and his torso. It obviously wasn't a very safe position for the ball to be in, but the ball wasn't "loose" (you can observe this by noticing how Cam has to rip the ball out of his grip instead of just picking it up). At this point, the Oklahoma player's knee is obviously down and you can argue that he has possession of the ball because it is not loose. If those two things are true, it doesn't matter if he lost possession of the ball while he was falling.
Again, I think it was a tough call to make. It's a judgment call on whether a player has possession of a ball for a small amount of time. I believe that if it was ruled a fumble and Tennessee recovery on the field, that also would have been held up in review.