it was a good theory but i don't think so, if sasuke is the only one who can free everyone from IT, and he decides not too, then everyone is pretty much screwed, because even though naruto might beat him in a fight (or they both die like naruto predicted) naruto still has no way to force sasuke to free everyone from IT. your theory kinda reminds me of the edo itachi and sasuke vs kabuto fight, but what saved itachi was the fact that he could put kabuto in a genjutsu and force him to undo the edo tensi, naruto cant really do that with sasuke so that conflict wouldnt be able to be resolved