Kabuto would be useless in this fight since all of kabuto jutsu will hurt sasuke as well.
Furthermore, Itachi Susanoo can tank amaterasu since amaterasu can't burn chakra.
Next, Susanoo vs Susanoo = Itachi wins via Totsuka blitz and Yata spam
Finally, Kabuto being useful again now that sasuke is soloed will take Amaterasu to the head since Oral rebirth requires rebirth from the mouth which is located on the head. If that does not work... well you know how it went down in the manga
No really. Kabuto can use his inorganic reincarnation jutsu on Itachi which as we've seen focuses on one person and instantly traps them. Also have to mention, it only get's something that isn't living therefore works best on edo tensei ninja.

Itachi will need to deal with Kabuto in order to get to Sasuke. Izanami is the only way to get Kabuto, and we know the cost of that - a left eye, Tsukuyomi, Susano, Totsuka no surugi and Yata mirror. This is what itachi has to pay and in the end he still has a very slim chance of defeating Sasuke.
I think your forgetting you can't burn something to nothing.
and anyway... Since itachi has amaterasu can't he jsut extinguish sasuke's flames :|
Amaterasu(black flames):- "they continue to burn until their target is completely eradicated... even if the target is flame itself."[
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] This is from the manga. As far as i'm aware. Sasuke is the Master of Amaterasu and can use the black flames much better than Itachi. Itachi can only spam them with his only eye. Whereas Sasuke can not only spam it but also control and extinguish it with just his eyes.
Izanami on both of them. GG.
lol nice try but I don't think Izanami can be used twice. Even if that was possible, you'd have Sasuke and Kabuto in genjutsu and Itachi blind and exhausted lying on the floor. In other words, there would be no last man standing. So no winner. :eww: