Guilty as Sin
Member
Good analysis Bigfoot.This explanation would make perfect sense if you think about it. Imagine an Uchiha fighting some other random shinobi. If they couldn't win using skill, they would use Izanagi to deceive the opponent into "thinking" that they were killed, sometimes they may have even been killed multiple times before finally eliminating that opponent. After that, they could easily go back to their clan, slit another members throat in the middle of the night, and then have another pair of eyes to spam Izanagi with
It probably then got to the point where every Uchiha was sick of the ridiculous amount of people getting killed so that other members could spam Izanagi. So they developed Izanami at the cost of the users own eye so that other Uchiha would think twice before going after another member for their eyes
I'm not completely convinced that someone with EMS can go blind, it is called Eternal Mangekyou Sharingan for a reason. If that were true, it would mean that Sasuke would eventually go blind, especially since he tends to spam Amaterasu a lot, which I'm not inclined to believe just yet. Either Sasuke is being reckless and doesn't care if he goes blind, doesn't know that EMS will eventually fade out and will suffer the consequences, or EMS is actually eternal.Didn't read every response, but let me throw out my positions on a few things.
First thing first, I believe 100% that EMS does not save a person from loosing their sight when it comes to Izanagi/ Izanami. Let's look at this logically. A MS user eventually looses their light, correct? But it is not actually based on using their techniques, it simply happens eventually no matter what. Using techniques simply accelerates the process; the more often they use them, the faster their eyes degrade. The point is that MS is a cursed eye, different from any other. Here's the point though: EMS simply returns a 'cursed' eye back to normal. It takes an eye that will eventually go blind and turns it into a normal eye, one that will never go blind unnaturally.
So imo, EMS doesn't save someone from ALL blinding effects, it just reverses the built in blinding effect of MS and turns a MS eye into a normal one that can still use all those amazing techs. Get what I'm saying here? I believe 100% that the rule of sight loss applies to EMS users as well, when it comes to Izanagi/ Izanami.
Anyhow, the main thing that interested me about this topic, is the jutsu spamming. Many people mentioned 'stealing eyes' in this thread, but they didn't really specify. I do think the Uchiha were stealing eyes, but not for EMS purposes. I think they were stealing them for purposes similar to Danzou, where they simply had more than 2 eyes at their disposal for use, but not EMS.
But even considering this, the fact that Kishi implied use of Izanagi by one person 3 or more times is still a plot hole imo. The only possible REAL explanation I can offer is that this Izanami/ Izanagi loop is happening so fast that a person can actually use the core of the Izanagi technique multiple times before their time limit runs out. I mean even if the tech only lasts for a minute, two Uchiha could still battle back and forth against a looping process for that duration of time. I hope you get what I'm saying, but I think this multiple use of Izanagi could be achieved by one single eye if the action is occurring fast enough.
The question is, is Izanagi/Izanami an exception? Are those among the few or only techniques that cause blindness despite having EMS? Or are they spammable? As some have suggested, Izanagi being spammable is an adequate explanation as to why Izanami needed to be created as a system of checks and balances.
But I don't discount the theory that the Uchiha were taking other people's eyes, not necessarily to have a perfect EMS, but possibly to imitate Danzo like you suggested. My only question for that would be: How exactly are they using those extra eyes? Are they implanting them? How does the process of using another eye work?
Anyway, good posts from the both of you.