He's done such a poor job with pacing, things have become somewhat convoluted story wise and in order to keep moving the story forward, keeps adding more characters to the endgame that were never foreshadowed. Madara is fine and having them meet the sage is okay too but to introduce his mother as the main villain so late along with his brother should never have been done. And throwing the brother in there all of a sudden means he's going to play a part too. Make up your mind too about the reincarnations. You say Naruto is Asura but then Kaguya and even ten tails see him as the reincarnation of the Six paths? And all the retconning, all the power boosts, Orochimaru is still around, the Sage appearing out of Madara's crotch...
I can't wait until none of it matters and it's Naruto vs. Sasuke. This is some of the worst work of a mangaka and I wish I was excited by this arc but I can't be.