1. Probably, i'll give you that. But the tech was invented for arrogant, probly strong Uchihas like Madara to stop them using Izanagi. If those Uchihas did'nt know about it, maybe Madara does'nt either.
2. He can use a kage bunshin or w/e. I'm not saying this is a VS thread and Itachi'll win, i'm just saying Izanami will work on someone like Madara.
3. Smh. Again, see my above point, i'm not saying this is a versus thread and that Itachi now wins.
4. Well, to be fair w/o Sasuke Itachi would not have been impaled by those rocks in the first place. Sasuke has been more of a burden than a help to him.
5. Its not for battle against anyone. It is useful against some people, Madara and Kabuto are 2 such people.
6. True, but Itachi is an edo here.
Ok, my bad I thought you were asking if it would work in a vs scenario but, I think it would be naive to think Madara is clueless about it, especially when we think about his status within the clan. If he somehow didn’t know, and he lived under a rock, I don’t see why he wouldn’t be caught. Granted we have never actually seen him under pressure, but the guy sure seem delusional.
Also Kabuto simply outmaneuvered Itachi because he knew Itachi would go for Sasuke, even though Sasuke never was the intended target. Itachi even apologized afterwards- after Sasuke saved him. I don’t believe Sasuke was a liability at all, Itachi just didn’t trust him and as I said none of this would have been possible without him.