Board Thread:Theories and Speculation/@comment-45444155-20200806114740/@comment-45444155-20200807201034

LegionZero wrote: Past Uchiha and Madara didnt need Senju DNA to use Izanagi.

Kishimoto made a retcon, Obito's words dont matter. Kishimoto changed the requirements for Izanagi later on, and in doing so made Obito's statement partially incorrect. Thats all there is to it.

As you wish, I don't see using Izanagi without Senju and Uchiha's strength. We've been told throughout the manga that the Yin-Yang concept is linked to Hagoromo. A concept that is divided into fragments / clans of Uchiha and Senju.

The manga is full of bloopers, which are allowed just to please the plot.