A lot of people made a theory that Tobi is a Zetsu clone due to his let Arm or some kind of experiment. Well looking through the arc where we go back in time and Tobi gets blasted by Minatos Resenagan you can see its intended to be blood.
I think that his Arm was just grafted back on much like deidras.
Blah its gonna be his Brother aint it.
I think that his Arm was just grafted back on much like deidras.
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Blah its gonna be his Brother aint it.