[Spoilers] I see

[AlphaSeed]

Obito was strengthened by minatos half of ninetails as black zetsu reattached, Obito then extended his white zetsu (hashirama dna) arm into madara (caught him off guard) and is also absorbing some of riduko power back (he snatches the staff).

Obito is going to then revive naruto, because what naruto said to him about being a true hokage .... Obito will save naruto, naruto will be some sort of riduko soon


on the other half of the field, the person approaching sasuke is riduko mom (evil chakra) , i have no clue how she pops up but i think its her as he just mentioned, her being the original misuse of chakra (perhaps something to do with the tree)...she will possess sasuke


the final fight between Sasuke and Naruto is coming

Sasuke cares only to stop the tailed beasts which naruto will have all inside of him at this point



i think

 

[Untamed]

oh you're right. I let it slip my mind the Black Zetsu had Kurama and now back with Obito again.

 

[Meowazziel]

One of the mystery person theories that isnt Kabuto, that I like.
I would find it cool if it is Kaguya and that she somehow pops up as the mystery person, maybe due to having been summoned in front of the Uchiha tablet (I believe she is the reaper) and due to the cutting of her stomache. It would need some explanation though and I am not sure if a character like her should be introduced at this part of the story. Original idea though.