I am going to pretend this is a sneaky way to bump you're thread because no one is hardly biting to how much effort you put into this theory but I will explain just for lols.
That doesn't make sense I want peoples inputs and discussion... Those who stumble upon this thread and reads it will give their inputs if you agree or disagree. No need to insult me for having a different opinion
Hiden has been shown he cannot regenerate from severe injuries like loss of limbs or decapitation it must instead be surgically reattached. However, his inability to die has been shown to extreme lengths such as when his body was tore to pieces by paper bombs and he showed no signs of dying whatsoever.
This is true. But it does make sense that the inner body reconstructs itself because he has to stab himself for his jutsu. Also this:
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Now my theory is he can survive anything but his body is still as durable as most Ninjas so if his body can be blown up by paper bombs I can guarantee a TBB will vaporise him.