Amusing!

You watched the fight from Sasuke against Danzou?
The combination of Danzous Fuuton and the powerful pull of his summon wasn't enough to move the incomplete Susanoo from the spot. Absorbing Susanoo isn't easy. You need to go in his distance to start to absorb it of course, and Susanoo is very fast, could crush Nagato with its long arms before Nagato comes to close to him. And you're forget about Totsuka, a ghostly weapon which can't be absorbed - Totsukas sword crush him. Amaterasu is to fast for preta too, as i already said, Amaterasu arises directly in Itachis point of view, it isn't a attack Nagato see coming.
How Itachi can avoid Chibaku Tensei I already explained above.
And as I see, you haven't arguments against Itachis genjutsu.
First, it does not matter whether we've seen a visual genjutsu on the Rinnegan, that's not a fact speaking for the Rinnegans immunity against visual genjutsus.
Second, Itachi hasn't only powerful visual genjutsus, he can catch Nagato with only a finger.
The Sharingan can see through illusions because it has got the ability, not because it's a doujutsu.
The Manga and the databook? Amaterasu has got the feature to burn anything, fire, chakra, no matter. The sphere consists - like Sasukes Katon - out of chakra. So if Amaterasu can even burn a huge fireball consisting out of chakra, a little sphere consisting out of chakra will be burn easily.
Try to reread the facts, look at the feature
of the Mangekyous abilities and the databook my son.