Board Thread:Theories and Speculation/@comment-3001903-20160325042952/@comment-734582-20160325121705

Caseather wrote: A goal of Orochimaru's was immortality, a quality of Hidan's. So.... It's not clear what Hidan's source of immortality is. It's possible that that very immortality will also create problems with possession.

It's also possible that upon hidan's body being taken over, that very immortality is lost.