We saw that naraku pain used some kind of jutsu with wich he summoned that strange (monster or soul?) and he extracted that guy's soul. It look very similar to the jutsu sarutobi (3th hokage) used but it doesn't bring death to user. So there is two explanationts : 1)if it should bring death and it doesn't that means pains body are really controled by chackra receivers and they're bodys aren't alive witch we already know cause the girl pain used for g\his new body was already dead. 2) its similar jutsu but it doesn't bring death to user why would naraku pain use that kind of jutsu if he can easily finish those ninja's without it?
What do you think?