No one part of the golf swing is any more important than another. It starts with the grip, the address position, the stance, the manner of the take a way, the torquing of the torso and shoulders, the controlled length of the back swing, the manner in which you load the back leg for the fill release of power, the setting of the lead foot, the turn of the torso and shoulders, dropping the club in position swinging through the ball not at it and finishing with the belt buckle facing the target. All of these elements make up the swing plane.No one element is good without all the others.