Im still not sure Hiruzen was retconned. His hype was directed to him in his prime which is a form of him we never got to see, except in one flashback where he was stated to be stronger than tobirama and he was still only a teenager.
I do believe Hiruzen could open all 8 gates in his youth. I'm even sure Hiruzen could
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so he himself didnt have to receive the damage (Much like what he did with DRS).
Hiruzen was undoubtedly a monster in his youth, which has been hinted to strongly in the manga. Mastering all 5 elements and every justu that existed in the hidden leaf. He outclased Tobirama and became hokage as a teenager. He personally trained the legendary sannin. At his old age his chakra was still as powerful as orchimaru and tobirama. And best of all Hiruzen had MONKEY KING ENMA!!!!
Oh boy, you played with lighting.
O.T: I think they ended him quick because he technically has no limits as a reanimated Kage.
^^ This right here.. Realistically he could have used a shadow clone to study Juubito's Truth seeking orb. Kishimoto just had to take him off the board.
Orochimaru summoned Hiruzen in his old age when every other Hokage was summoned in their prime forms.
May be he knew that Prime Hiruzen would be too hard to control,SMH.
LOL Very possible.
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, had he been in his prime he possible could have simply walked out of the rooom or used some crazy jutsu to put orochimaru under his control lol.