In most versions of the Naruto verse, Itachi, for some reason or another, cracks and massacres the Uchiha. Sometimes the Uchiha clan is massacred by someone else, sometimes the Uchiha survive, or there are more survivors than Sasuke. Now, as a rule of thumb, no matter which version, Sasuke always survives the massacre, if there is ever any, completely unharmed, more or less.
Now, of course, in this version of the Naruto verse, things went a bit differently cause, well, while Itachi was busy torturing his poor brother after massacring his clan due to frankly stupid reasons, brainwashing and martyr complex the size of his hype within the Naruto fandom. Now, in that super crucial moment, a R.O.B. had the equivalent of a car accident, causing Sasuke to become a vegetable, mentally speaking, of course.
Now, of course, no one wants to pay fines, so the R.O.B. set out to erase the evidence of his accident. That is where I, the great Yu Smith, failed Chinese American actor, who nobody cares for, not even god.
You see, the R.O.B. needed a desperate man who is a decent enough actor that nobody would miss, and can speak Japanese, to replace Sasuke. Yeah, so apparently I was that guy mostly cause in his search, I was the first name to come. I agreed cause he gave me some good old wishes which I accepted happily like a naive girl accepting candy from Diddy and getting in his van.
In this case, however, the van was the body of Sasuke, and Candy was a template system with access to every template ever, immunity to all power, ability, and skill manipulation that I did not completely agree to willingly, immunity to all forms of power, ability, and skill degradation. The wishes I made are a guarantee to protect me from ass fucking as the government protects rich white men caught on camera harassing young girls.