Wrong, Jack is Half ARCHANGEL Half human, he is much MUCH stronger from his first moment on earth than Jesse was even at the height of his power! Not only was jack the son of an archangel, he was the son of Lucifer, who in of power, was only 2nd behind Michael and not by much! According to lore given to is by the show, a nephilim's strength is determined by the power of the angel that sired it! Because the father was Lucifer, Jack was the strongest being ever created by an angel or demon! Also, no standard run of the mill demon was stronger than angels! So, Jesse's power while strong is still coming from something weaker than a basic, run of the mill angel!