When the QB has clearly finished his throwing motion and is returning the ball to his chest, it is obviously he is not trying to pass, any reservations on whether or not it was an attempted pass should be gone. That is when Dalton dropped the ball. This should have been a fumble. Also, I don't recall the direction of travel of the ball after the fumble, but if the tuck rule considers the fumble an incomplete pass, the ball should be traveling forward. I believe the "pass" by Dalton should have been considered a lateral instead of an attempted forward pass, therefore it should have been a fumble anyway.