You dont know where that body is.....
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Not much for me to type. Did Kishi forget that Nagato's body was transported to the Kamui dimension?
It's entirely possible Nagato's body was removed from the Kamui dimension after it was deposited there. But why would he?
If he didn't take the eye directly from the Kamui dimension, it makes less sense that Obito would take the body out, take the eye out, and then not put the body back. He would just ditch/bury the other Rinnegan? He'd suck it right back up, I'd think.