Board Thread:Theories and Speculation/@comment-31966672-20200409171208/@comment-6769189-20200424174234

CyberianGinseng wrote: Sasuke never states that super tiny details are why he can predict movements. He simply states that he can see what Naruto's going to do next and react accordingly. In some translations, he says his eye shows him an image of his next movement. "Super tiny details" being the reason for this image are your headcanon. Sasuke talks about how he can see the way power shifts in Naruto's body when he moves. At least in some translations he says it.

I guess this one boils down to which one is more accurate

CyberianGinseng wrote: Rock Lee only states that he doesn't have the eye to perceive and see through the counterattack at head on at that speed and that Sasuke has the Sharingan plus his speed. Kakashi once said something like Obito's eye allowed him to complete his jutsu. When does anyone else "constantly" say the Sharingan is needed for Chidori? The reason the jutsu was "incomplete" was because of the tunnel vision, as Minato explained. As you pointed out, Kakashi said the Sharingan "completed" it.

Kakashi developed Purple Lightning because he couldnt safely use Raikiri without Sharingan.

In one of the novels Kakashi didnt want to take the Hokage position because he felt he was too weak without the Sharingan and Raikiri

In Boruto, Sasuke told Boruto couldnt teach him Chidori because it only works with the visual insight of Sharingan.