itachi has access to all his abilities including izanami and immortality
sharigan: the sharigan is able to track light speed with two tomeo so imagine three
and is capable of using genjutsu.
Already I see fail in this OP.
For one immortatility wont do jack shit against Akuma since he can directly attack the soul and destroy it.
And second, the Sharingan cannot track "Light speed" with any amount of tomes. Show me physical proof of this (Hint. Haku was bullshitting about his claim, have fun with that), because if it could Sasuke would not have had any trouble against Killer B at all, Or Kakashi for that matter when he struggled to dodge the Arrows from Sasuke's Susanoo, Or Sasuke again when he fough pre-time skip Naruto and could not keep up with a change in his cloak (Would have been simple for him to dodge if what you are saying is true since he would have seen the chakra alter its shape at such a slow pace it makes watching the Room fly by.
And honestly why do you feel the need to bump your threads? If someone wanted to reply to them they would have. I count no less than 4 of your own threads bumped by yourself in the last 20 minutes. Now im not sure if there is a rule against that but I consider it spam myself. You even have a double post in one of those threads with the same text (Kabuto wins).
As for the fight, im not sure entirely. Im more inclined to lean towards Akuma and Ryu.