Then why did JJ Madara run from Sasuke in chapter 674?
So you're referring to JJ Madara w/ one Rinnegan. Well, Madara didn't actually run away from Sasuke, I think his main objective was to attain the other eye. That's because according to feats, JJ Madara w/ one Rinnegan is inferior to Sasuke. But despite that, I called it a draw because of JJ Madara's near infinite chakra levels and the immortality factor which gives him resistance or advantage in some aspects to make up for his lack of feats compared to Sasuke. Refer below for more.
Woah war arc sasuke and naruto were individually over one eyed madara (jj )
Firstly, I hope you won't disagree with me if I say JJ Madara (even with one Rinnegan) was slightly nerfed against Naruto and Sasuke. He could have done noticeably more than what he did. Secondly, the only reason I called JJ Madara w/ one Rinnegan equal to Sasuke is because of JJ Madara's near infinite chakra levels and that immortality factor. Sasuke is better by feats.
In other words, going by feats:
Rinnegan Sasuke > JJ Madara w/ one Rinnegan
But due to Madara's extreme chakra levels and the immortality factor:
Rinnegan Sasuke = JJ Madara w/ one Rinnegan
However, JJ Madara w/ double Rinnegan is equal to Sasuke by feats, he is still inferior in the eye power department (Sasuke's Rinnegan is superior + Susanoo) but equals it in the body power department (Six Paths Senjutsu + Godoudamas). But I declared him superior because of the very same reason that he has near infinite chakra levels and immortality.
By feats:
Rinnegan Sasuke = JJ Madara w/ double Rinnegan
But due to Madara's extreme chakra levels and the immortality factor:
Rinnegan Sasuke < JJ Madara w/ double Rinnegan