Puzzle shows both responses
Good point. I thought that poor beleaguered Puzzle fell too easily into peer pressure out of fear of losing Shift's friendship so he did whatever he was manipulated into doing but then toward the end we find him coming into the new Narnia, afraid at first to confront Aslan (though I never thought he was directly at fault, but used and controlled for Shift's power and prestige), so apparently Puzzle overcomes (maybe by observing the events?) peer pressure and sees the one true source of self and happiness - found in at least trying to find and know Aslan and to seek Narnia, where everything is genuine.