If he were running into the end zone and had the ball in his possession for a split second as he crossed the line, it’s a TD regardless of what happened after. A pass is no different. He clearly caught the ball, had momentary possession within the confines of the end zone to secure a TD, and then safely dropped it, as he no longer needed to prove the obvious score. If anything he probably held it longer than was necessary and it could’ve drifted into taunting/delay of game territory. Fortunately Jabar took the high road.