Well I'm not sure about the paticulars of Oro's immortality jitsu, but there's always the chance that some one gets to kill him in one paticular body, probally taking that person with him, then he shows up much later in the magna after just about every one has forgotten abou him and then Naruto has to finish him off, who knows he may even be forced to perform the 4'ths jitsu on him.
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