Okay, yes his consciousness layed Dormant while Sasuke had the chakra to supress him.But how did releasing Oro hinder him at all? The fight was pretty much over after Kirin, so him coming along prolonged the inevitable defeat. Him releasing Oro isn't like undoing the seal for Naruto where he actually would die. nothing happens to Sasuke (
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Unless your saying he looses his life when he interferes because he was
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. That could just be chalked up from his exhaustion & pain though.