Board Thread:Theories and Speculation/@comment-31099706-20170327120301/@comment-26773508-20170412050500

Itachi's end game of that particular "watered down" Tsukuyomi would be the SAME as the end game of the whole battle in the first place: weaken Sasuke just enough to draw out Pedochimaru from Sasuke. Since genjutsu disrupts the chakra circulatory system (with shit like Tsukuyomi fucking the system up entirely), it is not hard to imagine that Pedochimaru would take advantage of the serious disorientation in Sasuke's chakra to overcome his imprisonment and take over Sasuke's body. Seeing as how Itachi was using Amaterasu with no hesitation, I find it hard to believe that the Tsukuyomi was just some devious deception on Itachi's part. Itachi wanted to push Sasuke to the limit, and using a watered-down Tsukuyomi would negate that fact and PROLONG THE BATTLE, thus DECREASING Itachi's chances to kill Orochimaru since he knew his end was imminent and he could die any time.

And like @Blaze said, even a basic 3-tomoe Sharingan is extremely OP compared to other KKGs. Plus Sasuke possessing large bits of Indra's chakra/potential, coupled with his personal mastery of the Sharingan, makes it entirely plausible that he broke out of Tsukuyomi in spite of the possible use of time manipulation. Being of the same "blood" as Itachi, as well as being a genius on his own right, it is entirely believable that Itachi did use time manipulation and Sasuke broke out of it.

In a nutshell, I find it hard to believe that a terminally ill Itachi, who knew he was going to possible die within the next hour, would purposefully make the battle last longer when he was actually desperately short of time. He knew Sasuke was a genius in his own right and, being an Uchiha, he knew Sasuke's fully-developed sharingan would offer better clarity of perception than the last time he faced him. Couple this with the fact that he showed absolutely no hesitation while using Amaterasu, one can only conclude that Itachi wanted to draw out Orochimaru as fast as possible. Watering down Tsukuyomi would delay that and potentially destroy everything Itachi had suffered for. It seems many of you are disregarding this fact.