Well, there seems to be a clear connection between one's chakra and one's soul anyways. Didn't the 4th Hokage seal both his own chakra and Kushina's chakra inside Naruto along with Kurama?
I didn't expect it, but so far his revival does seem to adhere to the "Magic A is Magic A" rule.
Also, Juugo doesn't have a curse seal, he is the ORIGIN of the curse seal. Or more specifically, the curse seal was created by Orochimaru using Juugo's blood I think.
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