If Madara has the ability to absorb jutsu, then there's no need for him to fight, practically he is invincible.I didn't say that. He has the Sharingan so it is easy for him to learn the opponent's jutsu. So maybe instead of injecting himself with DNA his EMS enabled him to copy the mokuton and since Hashi was a pro and Madara copied directly from him he got the basics and that was enough for him to be able to use Izanagi successfully.
Or maybe he absorbed some of the 1st's other skills with an unknown jutsu.
If you could copy the 1st jutsu, then there will be no need for Oro to experiment, there's no need for Danzo to inject himself with the 1st DNA. There's no need for Madara to be injured. Hell they might even be able to teach it in the Academy if that's the case.
If it's not special then Izanagi doesn't need the 1st power.
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Madara: "That's a mokuton..."
No eyes techniques could copy a KG jutsu or even some high rank jutsu.
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