No one knows if he crossed the goal line at all no way to tell. TD on the field the replay wouldn't show anything to change it, it's really that simple unless you're Scott Zolak.
I guess it is possible he lost possession twice and had possession for the split second he was over the goal line. The tape shows him not having possession right before the goal line and then the ball goes out of view. The next time you see the ball he is on his back out of bounds putting his hand back on the ball. I guess the only thing we know for sure is that he didn't have possession right before and right after he crossed the goal line. I guess we will never know what happened the split second he crossed the line.