The intelligence Fugaku provided answered one of Hyuga Kagami's doubts.
That was why, whether in the original timeline or this one, the Uchiha Clan, having resolved to rebel, had not shared the forbidden technique "Izanagi" among the clan.
After all, activating Izanagi did not require a Mangekyō Sharingan. An ordinary Three Tomoe Sharingan was enough.
Moreover, when true Uchiha used Izanagi, both the duration of the forbidden technique and the window during which it took effect could be adjusted within a certain range according to the caster's will. It was nothing like Danzo's cheap imitation of Izanagi, whose duration was rigidly limited to one minute.
If one's ocular power was strong enough, Izanagi could even rewrite the fates of dozens of people at once.
When the reanimated Itachi explained the two forbidden techniques, Izanagi and Izanami, to Sasuke in the original timeline, there had been a scene in which one person activated Izanagi and rewrote the deaths of dozens of people around him.
Therefore, the forbidden technique Izanagi could not only rewrite the caster's own fate, but could also serve as a "group resurrection technique" with a strict time limit.
Although spreading Izanagi was not necessarily a good thing for the Uchiha Clan either.
For the Uchiha Clan, however, already standing at the edge of a cliff, where a failed rebellion meant the extermination of the entire clan, the minor risks of spreading Izanagi were nothing at all.
Any clan head in his right mind would have shared Izanagi with every clansman without hesitation, further strengthening the clan's combat power.
Just imagine it: if every Uchiha with a Three Tomoe Sharingan had two lives to spend, and could even deliberately create opportunities to escape through methods such as delayed resurrection, then even if Obito, Itachi, and Root had joined forces