Well on instant replay it sure didn't look like he had it over the plane. Are you saying that he had ahold of it when it was over the plane and then when he came down he and the ball moved backwards? You can actually see him move it out from well underneath him and then place it over the goal.
At the height of his leap, the nose of the ball was over the front white line of the end zone stripe.....it was a touchdown.....
actually yes...
the defender's hit knocked Rothliesbergerisnslihjasldfoainhgan's arm backwards before he hit the ground.