I know most will not agree, but I am going to say yes. He could have let the Master live and take over the world with his dad, but he chose humanity. I think the turning point for Zack came when he was with the Master at the Empire State Building looking out over New York and realizing that everyone was going to die. I saw something in his eyes. He asked to accompany the master to the bomb lair because of that. I don't know if he just wanted to save his dad in that moment, but in the end I think he chose humanity.
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