Board Thread:Theories and Speculation/@comment-31099706-20170327120301/@comment-31099706-20170521020350

I agree with @Thekillman.

@Kakashi. Well we don't fully know if he let Kakashi live by Tsukuyomi or not but considering Itachi already unnecesserily killed alot of innocent Uchihas(like his mom,Izumi, Uncle and Aunty, and other possible innocent Uchihas too), I wouldn't see a reason for him to blow up his cover by leaving a old friend alive.

And I think I heard that Itachi's character got changed during the part 1's ending or part 2's begining.

And anyways Kakashi seemed to imply that Itachi could kill him when he was unconscious by Tsukuyomi and considering Kakashi isn't Rock Lee who fights even when unconscious, I don't see him defending at that time.

Itachi used a full powered Tsukuyomi on Sasuke.