But he does not know deva is the strongest .. Im not saying that it takes a while to burn the targets.. im simply saying it would be hard to hit each one while there quickly moving around the susunoo, yes they can dodge it .. seeing as they are continuously moving around, sasuke would have to concentrate to hit one, which would add more time for deva to charge ( although he does not need much) Or give time for preta to begin absorbing ..
Quickly moving? Sharingan allows him to easily track their movements and know where they will go next. It won't be hard to get them at all and instead of using multiple Amaterasu he can just use Kagutsuchi to incinerate the paths with no defense.
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From that scan it seems that the flames move as fast as Naruto's FRS (Which is fast) Them moving doesn't change anything. Its not like any of the Pains had any tremendous speed feats in the first place.
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This formation allows for Sasuke to light one of them up and hit the others with Kagutsuchi by controlling the flames he had just used...don't see why this formation is a factor even though this was only taken when Deva had used CST meaning no powers.
Unless Pain is going to jump straight to CT then he will use his abilities and as he uses his abilities Sasuke will be able to figure out which one looks the most dangerous. Which would be Preta and Deva considering they are the only ones he can't one shot.
Even if Susanoo melee won't work, Sasuke still has his sword.
Not to mention Enton spam will bring on the inevitable Kirin, which is a KO.
It go either way with manga intel but with full intel Sasuke wins way more than he loses.