since akatsuki wants all bijuu they must know like every thing about the jinchuriki
so pain prob knows after naruto leaves 4 tails he is knocked out so he wants him to go kyuubi so yamato will have to stop it and he can just take natuto
so pain prob knows after naruto leaves 4 tails he is knocked out so he wants him to go kyuubi so yamato will have to stop it and he can just take natuto