As, we saw in the recent chapter, the Four Edo Hokages were immune to the effects of Infinite Tsukuyomi.
I and many others thought that the Edo Hokages were dead and thus were immune to Infinite Tsukuyomi. But, I didn't think so. After a bit of thinking, I made a shocking discovery.
All of the Four Edo Hokages; i.e; Hashirama, Tobirama, Hiruzen and Minato have a connection.
You guessed it right, all the Four Hokages were sealed in the stomach of the Reaper Death Seal Spirit.
How does the above make them immune to Infinite Tsukuyomi ?
Well, there have been many theories which said the Reaper Death Seal Spirit was actually Kaguya.
If we assume that Kaguya was the Reaper Death Seal Spirit.
We know that Kaguya was the first person to use Infinite Tsukuyomi by the Rikudou. This might hint that Kaguya herself was immune to Infinite Tsukuyomi.
It's possible that the Four Edo Hokages were trapped in the stomach of the Reaper Death Seal Spirit (Kaguya) and obtained Kaguya's immunity to Infinite Tsukuyomi and her chakra from there.
We have even seen a similar case scenario in the manga earlier :-
Kinkakau and Ginkakau were trapped in the Kyuubi's stomach and gained the Kyuubi's powers and chakra.
Conclusion :-
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I and many others thought that the Edo Hokages were dead and thus were immune to Infinite Tsukuyomi. But, I didn't think so. After a bit of thinking, I made a shocking discovery.
All of the Four Edo Hokages; i.e; Hashirama, Tobirama, Hiruzen and Minato have a connection.
You must be registered for see images
You must be registered for see images
You must be registered for see images
You must be registered for see images
You must be registered for see images
You guessed it right, all the Four Hokages were sealed in the stomach of the Reaper Death Seal Spirit.
How does the above make them immune to Infinite Tsukuyomi ?
Well, there have been many theories which said the Reaper Death Seal Spirit was actually Kaguya.
Theories which said that Kaguya was the Reaper Death Seal (There may be more but I couldn't find them) :-
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If we assume that Kaguya was the Reaper Death Seal Spirit.
We know that Kaguya was the first person to use Infinite Tsukuyomi by the Rikudou. This might hint that Kaguya herself was immune to Infinite Tsukuyomi.
You must be registered for see images
It's possible that the Four Edo Hokages were trapped in the stomach of the Reaper Death Seal Spirit (Kaguya) and obtained Kaguya's immunity to Infinite Tsukuyomi and her chakra from there.
We have even seen a similar case scenario in the manga earlier :-
You must be registered for see images
You must be registered for see images
Kinkakau and Ginkakau were trapped in the Kyuubi's stomach and gained the Kyuubi's powers and chakra.
Conclusion :-
1) The four Edo Hokages were trapped in the Reaper Death Seal Spirit's (Kaguya) stomach.
2) Kaguya was immune to the effects of Infinite Tsukuyomi because she was the one who casted it. ( If Kaguya was not immune to Infinite Tsukuyomi , then who will break the Genjutsu considering everyone falls under it ? )
3) The Four Edo Hokages; i.e; Hashirama, Tobirama, Hiruzen and Minato became immune to Infinite Tsukuyomi after spending so many years in Reaper Death Seal Spirit's (Kaguya) stomach and by obtaining Kaguya's Chakra.
Note :-
2) Kaguya was immune to the effects of Infinite Tsukuyomi because she was the one who casted it. ( If Kaguya was not immune to Infinite Tsukuyomi , then who will break the Genjutsu considering everyone falls under it ? )
3) The Four Edo Hokages; i.e; Hashirama, Tobirama, Hiruzen and Minato became immune to Infinite Tsukuyomi after spending so many years in Reaper Death Seal Spirit's (Kaguya) stomach and by obtaining Kaguya's Chakra.
Note :-
Before, you comment, let me say that this is a very far fetched theory in my opinion. I decided to share this because it seemed an interesting concept to me. Thanks for reading. 
Tying up the Loose ends of this theory here :-
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