It's a pretty straight-forward rule. If you don't have possession through the entire completion when you go to the ground, it's not a catch. It's not a new rule and wasn't a terribly difficult call for the refs. The only question, as they said, was whether there was a second move. There clearly wasn't, so the call was upheld. on the other hand he had clear possession of the ball with two feet down and then his body, and upon thinking he had the td already he kinda just let the ball go it clearly wasn't him losing control of the ball at all, he just thought the play was over oh well whatever, we should have won the game anyway with a FG instead earlier in the game so this makes up for Lovie's amazingly awful coaching