This is a thread based on an explanation to the event in which Sasuke one-shotted the Bijuus.
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Note : This thread needs manga panels as evidence, so I would appreciate if you guys can collect it for me. I have slow net. MP means Manga Panel.
First off, we know that the Bijuus were in a complete circle when summoned by Hagoromo.
MP: Showing Bijuus in circle.
Now, we know that Sasuke didn't spin like a Ballerina to bring every bijuu in his Vision Range and put them in Genjutsu.
MP: Sasuke standing in same spot, didn't move an inch after Rinne Genjutsu.
On Top of that Hagoromo said Sasuke did it with just a glance, so complete eye contact didn't happen.
MP: Insert Hagoromo Statement panel.
So, how did all the Bijuus fall under Rinne Genjutsu ?
Explanation - 1 : Bijuu Mind Link
We know that all the Bijuus have a mental link to Naruto. They are separate mental entities with a connection.
MP : Hagoromo's statements of Kuruma being a mental link between Naruto and Bijuus.
MP: Bijuus co-operating with Naruto mentally throughout Madara - Kaguya - Sasuke (Only Kuruma) Fights.
We can assume that if one bijuu falls under Rinne Genjustu, the Genjutsu spreads through the mental link and puts all the Bijuus in Genjutsu.
But, this also makes Naruto fall under Rinne genjutsu because of his mental link to the Bijuus.
The only reason Naruto didn't fall under Rinne Genjutsu was because Sasuke wanted to fight him.
MP: Insert Panels showing Sasuke's resolve to fight Naruto.
If a bijuu falls under Rinne Genjustsu, there is no one to break Naruto out of said Genjutsu thus the "Perfect Jin Immune to Genjutsu" statement is invalid.
Explanation - 2 : Izanami Workings :-
We know that Izanami is a genjutsu that works on all senses rather than only vision.
MP: Put panels of Itachi saying this after putting Kabuto in Izanami.
Rinne Genjutsu perhaps works on the same principle as it didn't require eye contact. ^See Above.
This makes Rinne Genjutsu extremely OP as it's instant (Supported By Hagoromo) and requires no long term preparations like Izanami.
MP: Find panels showing Itachi saying that Izanami takes time to set up.
This also would explain Rinne Genjutsu/Mugen Tsukuyomi working on Blind people; it works on senses, not on Vision.
Sasuke has a watered down Mugen Tsukuyomi. Why you may say ?
Well, if Sasuke can block Mugen Tsukuyomi, why can't he cast it ? All that he would need will be the moon to act as an eye to put everyone in the illusion. Sasuke can easily create a Moon by using Chibaku Tensei.
MP: Panels of Black Zetsu saying Sasuke can block Mugen Tsukuyomi.