I think I remember seeying I don't know how many times along the series in Sasuke's memories when arriving home the night of the massacre both of them lying on the floor in a pool of blood and Sasuke flippin'out!
they were there to be found weren't they?
sasuke could have been in a genjutsu the whole time.
Am talking about the time the fox attack the leaf and madara spar with the 4th