Alrighty then. Alive Itachi = crappy ass stamina, can't spam MS techniques (He can use 4 of them at most and even that's cutting it close) and if he uses Susano he'll succumb to his illness.
*****When Sasuke fought Danzo, Tobi stated the battle would be won by whoever could outlast the other.****
Sasuke was extremely tired at the end of the fight and he kind of drawed against Danzo. They impaled each other with chakra blades, but Sasuke bit Karin and healed. It was virtually a tie, but Sasuke had help. Furthermore, Danzo said he was holding back to fight Madara. Sasuke's stamina > Itachi's stamina.
Danzo can make death or any damage taken to himself become an illusion 10 times. This means if Danzo is hit with Tsukuyomi 5 times and Amaterasu 5 times, Danzo takes it like nothing. Considering it's impossible for Itachi to spam MS that many times Itachi will be drained, and blind by the time Danzo uses his 5th Izanagi and recovers. And he takes it.
Also, Danzo is a master of seals. The seal he placed on Sasuke? Only way to overcome that is to use a complete Susano which will further drain if not kill Itachi. Not to mention, even with Susano up Danzo was already going to kill Sasuke, if not for Sasuke's quick thinking. Itachi won't have the luxury of Susano, unless he wants to die.
I really do not see Itachi winning. If by some miracle he does he'll be exhausted in the end and the seal Danzo has that activates when he dies will take Itachi out.
