Wait wait wait ... Plothole?

[ObitoGokuKakashi]

Yes he did. With his Mangekyou prowess, he used it in a similar manner Itachi did with Sasuke's eye.

It activates under certain conditions or time. He is Madara after all.

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[mohdzarif]

I knew about this but hrmmm....

I just chose not to think about it, but instead say that Hashi's meat in his mouth somehow counts. :|

 

[Tobi98]

Senju DNA only makes it perfect (like it lasts much longer), without it you can still use it but it only takes some seconds

 

[Klad]

Tobi was a liar.

In the Itachi n Sasuke vs Kabuto fight, Itachi said that all the Uchihas can use Izanagi.

That's a weak justification

Senju DNA makes it last longer/ or more perfect.

 

[AGoodBoy]

Itachi already proved long ago that that was BS and Obito doesn't know his ass from his head.... Obito got his info from madara.

Madara and Itachi got their info from history. their opinion >>>> Obito's.

That's a weak justification

Senju DNA makes it last longer/ or more perfect.

^^^that's the only use of senju dna with izanagi/izanami