Itachi wasn't trying to kill sasuke, also it's a logical inconsistency,you can't have people one shotting each other via the amaterasu,how it works is "Amaterasu produces black flames at the focal point of the user's vision",again,it is not a projectile,it produces black flames at whatever the user is looking at currently,there is a projectile version too but it's called a kagutsuchi.Also the will breaking thing,i was sort of playing with words,again if it was will breaking,it does not attack you will,it attacks your mind,genjutsu cuts off your consciousness from your body,you can't break out of a genjutsu by your own,unless you yourself have a similar level of mental prowess(TP atttack/resistance) to the caster,having high will power does nothing to stop a genjutsu.and as far as all fights we have seen,sasuke has always went for genjutsu,against deidara,or sai,or orochimaru and danzo,the moment sasuke goes genjutsu,and he will,the fight is over.