You's skill and power are impressive, but they pale in comparison to Opponent's transcendent and boundless traits. Even with Xero's sharp weapon abilities and hovering capabilities, Jack's traits, especially his omnipotence, make him nearly invulnerable to attacks. Additionally, with Jack's eons of battling experience and observation, he would have the upper hand in strategizing and outmaneuvering Xero. Therefore, in this battle, Opponent is the clear winner.