I wonder why nobody ask how the heck Uchiha Madara knew how to cancel the contract of Edo Tensei. We all know that Edo Tensei was originally made by Second Hokage, was developed by Orochimaru then further enhanced by Kabuto. Am I missing some info?
There two ways I think the reason how Uchiha
Madara knew the seals, 1. He co-created the
jutsu; 2. He somehow used genjutsu on Second
Hokage and forced Second Hokage to reveal the
secrets of Edo Tensei. Itachi only freed
himself from the "bind of the talisman"
using Kotoamatsukami but not from the Edo Tensei
contract as shown he disappeared when the seal to
release the jutsu is made. While Uchiha Madara
used hand seals to release himself from the Edo
Tensei contract making himself unaffected by the
release of Edo Tensei by the user(Kabuto).
it wasnt developed by oro he just used the jutsu
the 2nd had thats all, and all kabuto did was add
more people to it. madara was alive when the
village was made and has seen the jutsu so why
wouldnt he know about it.
Seeing the jutsu itself
won't necessarily mean you'll know how
the whole jutsu work(cancelling the Edo Tensei
contract seems to be different from releasing the
Edo Tensei). Yes, Uchiha Madara was alive even
before Konoha was established but he hid himself
after his battle with Senju Hashirama making
everyone believe he died in that fight. Assuming Uchiha Madara did saw the Second Hokage
or Orochimaru performed Edo Tensei, was there any
chance that Second Hokage's or
Orochimaru's summons with Edo Tensei
cancelled their contract like what Uchiha Madara
did? Uchiha Madara said himself, "as long
as you know the seal, you can release Edo
Tensei's summoning contract
itself". Kabuto didn't just add
more people, he also did some modifications to the
Edo Tensei such as infusing Uchiha Madara with
Senju Hashirama's cells which wasn't
done even by Orochimaru.
Tobirama didnt free himself
from edo when oro summon him because oro tags he
usee to control the body were stronger than the
one kabuto had on most of his revived. Madara
probably have seen the jutsu b4 since he always
battle hashirama so I'm sure he's seen
also shown Tobi how Edo Tensei is prepared/done.
It is not a jutsu you do from scratch while in the
midst of battle. Assuming Madara did saw Tobirama
use Edo Tensei, how did he knew that using
specific hand seals would release the contract of
Edo Tensei itself when fighting Edo Tensei
doesn't even give any clue about that!?