I should have also said that he has to maintain possession after landing on the ground. For me, this is a silly rule. It may have arisen due to the catch the Cowboy's Butch Johnson made in the Superbowl. Lots of people questioned whether or not that should have counted as a TD. For me, it was a TD, nit because he was a Cowboy, but because he had possession long enough, with possession in the end zone.
Let's say that a RB goes up and over for a score but his body never makes it into the end zone. However, he does exrand the ball over the goal line breaking the plane. It is a TD and should be whistled dead immediately. Does not matter if a defensive player slaps the ball out of his hand after breaking the plane. Play is overwhen that happens.
When this receiver caught the ball as it was breaking the plane of the goal and he comes down with two feet in bounds, to me, it does not matter what happens after that, but that's just me, I guess.