What If: Itachi Was Actually KA'd.
This is a hypothetical situation, purely for making you think. I do not actually theorize, nor do I believe that the following is the actual turn of events. Here it is: What if at the moment Itachi saw Shisui, he was KA'd to "protect Konoha at all costs"?
Itachi may not have completely decided what to do about his clan and the village. Remember, he was torn by guilt and sorrow at what was asked of him. He even wept as he killed his parents. Is it possible that Danzo ensured Itachi "made the right choice"?
This is the scene in question:
Shisui is bleeding from one eye and holding his other eye in his hand. This may have been KA at work, giving Itachi a false experience. We know KA is considered to be the highest level of genjutsu and can hit without the opponent even noticing.
Now Itachi was going on and on about what "reality" and "truth" really is. What if this is the prime example? Now, why would Shisui KA an "unsure" Itachi? Danzo. He asked Shisui to provide this false image (activating KA through his left eye ((leaving it unusable for a decade)) and presenting Itachi with the right one for future use. Shisui absolutely believed in self-sacrifice and would be willing to do it for the village. And so, under KA's influence, Itachi programs the right eye to "protect the village at all costs" so he could use it on Sasuke. Shisui's tech had a domino effect: He programs Itachi, Itachi, under programmed loyalty, programs the eye for Sasuke's benefit. All a well-laid plan for Danzo..or would have been.
Hope you enjoyed the read. Remember, this is a what-if and not an actual theory. Just something fun to read and think about. Thanks!