lol that's the biggest bullshit I've read so far.
Not only is that not true, but that makes no sense.
Firstly, Sasuke was in peak condition when he entered the fight. He wasn't stressed out yet from using the MS. His vision was solid
Secondly, Itachi was going blind and still managed to cast it on Sasuke's location.
Thirdly, Amaterasu casts on what is in your line of sight. After Aye dodged it, it hit the samurai behind him....that means both he and Aye were in his line of sight.
And finally, even if you have poor vision, you can't focus on nothingness. There is no possible way for him to cast Amaterasu a few inches away from Aye because even if he has blurred vision, he still can see Aye's location.
This just demolished your theory.
Owned.