Before I share my thoughts, I want you to take 3.5 seconds to think of an answer to this question:
Who is going to be the 1 Man to stop and seal Edo-Madara???
Well, base on a hypothesis that I came up with by myself I believe the 1 and only person who can stop him right now is..... OROCHIMARU!
It sounds strange doesn't it?
Is it just me or does he seem totally unworried about the whole war and the fact that Juugo has alerted both him (inside Anko) and Sasuke that Edo Madara's is still in existence despite the fact that Itachi manipulated Kabuto to release the impure world resurrection jutsu?
The reason why he is totally unworried is because HE KNOWS HOW TO PUT A COMPLETE STOP TO EDO-MADARA. Now I don't know how he will do this but it maybe possible by either the curse mark located on his right arm or by another forbidden jutsu which was used by Hashirama to halt Madara's movements.
Many may troll and disagree with me but this is the same man who by some means discovered Elderly Madara's corpse [& I think it was buried at his current hideout because after all, he's a missing nin. Just look at this place]
and furthermore Orochimaru is the man who implanted Hashirama's cells into both Danzo & Yamato (I almost forgot his name because he hasn't been mentioned for more than 1 year).
So if you have any other ideas to this theory add on. Prove me wrong for Konoha's Sake & Future