Tsukiyomi is Far Stronger than Ma and pa's Non'Kekkei Genkai Genjutsu. WHy do you think itachi is praised for his genjutsu and not Ma and Pa.
And it makes NO DAMN SENSE in using Tsukiyomi on a EDO TENSEI since Tsukiyomi is not stronger than Shisui's Kotoamatsuki. So using tSukiyomi would Be pointless when Itachi can just Seal him away instead. if it was the Real,uncontrolled nagato, Then of course itachi would've used genjutsu like he mostly does to end it. But kabuto perfected the Reanimation Jutsu therfore making it almost impossible to escape it. (Allmost) So Genjutsu wasent A Option Towards a Reanimation Summoning. Unless its the Strongest genjutsu(Shisui Kotoamatsuki)
and like i said Genjutsu Is Genjutsu: Dosent matter how it's delivered.
for example: I kick a ball at you, Then I Throw a Ball at you, The same thing Happened Right, The only thing diffrent was How it was delivered, But the Outcome and result was Exactly the same.
So once again Nagato most likely isnt immune to Genjutsu.
Even jiraiya's Sound Genjutsu Turned into a Visual setting. It showed Pain inside of some Cube, Pain saw himself inside of a cube, basically thats Visualisation since PAin had to "See/Visualize" that he was inside of an cube, and he couldnt even get out So basically Jiraiya used SOund To trap pain in a Visual Genjutsu.
A Straight-up Sound Genjutsu is Kin's Which she used on Shikamaru. Jiraiyas genjutsu was "reached" to pain By SOund, But resulted in a Visualized effect towards pain. Basically making it a Visual Genjutsu. But it was delivered in "sound''
And Amaterasu burned Nagato's Hand since nagato was too slow to react towards the flames. But since he was an Edo Tensei He regenerated And used Shinra Tensei to get the flames off of him. If that wasent an Edo tensei , Nagato wouldve lost his hands therefore leaving him "Jutsu-Less". SO itachi wouldnt use it a Second time, if he knows Kabuto would just Regenereate nagato. .
And Yata Mirror is an Supernatural Ethereal Sheild, its not just ANY sheild. It's Said to repel all attacks for a reason ,and how do you know if its vulnearable to Banso tensin, that wasent proven anywhere, but it did state Yata Mirror repels all attacks. Although i bieleve Yata mirror cannot repel it. But we dont know how much Susano'o Weighs, so nagato would have to use an tremendous amount of force and chakra, lifting up something that big With that Mass. And Susano'o is Heavy since When he landed to save naruto & bee, The Shockwave from Susano'o Blew off Nagato's arm, and kabuto regenerated it
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And attacking Chibaku tensei repeatdedly is Not a waste. It will eventually destroy it before it completes itself. But if it completes itself then itachi is dead.
And no one knows How Strong Yasaka No Matagama is. Who knows............it may be stronger than a tailed beast bomb, Although i don't Believe So. But Any move from Susano'o should be powerful especially from Itachi's. And The Blade Of Totsuku extends so If chibaku tensei is used on itachi, it would just leave nagato wide open, for itachi to seal him. Since it takes a While to gather up the rocks, Itachi would easily seal him since it takes a few seconds to Stab him with Totsuku blade Or Seal him. Or he can Just Amaterasu chibaku tensei since it's Nothing but Rocks and Chakra.
Nagato's moves leave too many openings. 5 second delay from Shinra Tensei, No movement when using Chibaku Tensei, and
can only use 1 path at a Time thefore allowing him to use only 1 technique at a time.
And it's common sense to use 2 jinchurki to help you just incase.
And if you payed attention Itachi NEVER underestimates his oponents, no matter who they are. SO he was being cautious and not over-confident. which is smart. And theres no proof that Matagama isnt stronger than a Tbb. Not saying that it is , but theres no proof...