not rlly , he kinda gets the skill from the battle , and he is really good at it
Training is not his thing - Random powerups are .
but even so he has enough training and mastery of his skills
he is better at Amaterasu , clearly better than Itachi
What do you mean he's better at Amaterasu? At controlling the shape? That's about it isn't it?
Itachi has shown perfect controlling and speed of the Amaterasu when he was chasing curse mark sasuke. And even caught Sasuke.
And Itachi extinguished Amaterasu twice when he was fighting Sasuke..
(When he pretended to take sasukes eyes) even zetsu said "He extinguished the flames" (And when he shut his eye, extinguishing it, after he overcame sasukes fireball with Amaterasu).
The only thing i saw Sasuke do better was putting it aroung his Susano'o.
Where's proof that Itachi can't do that? Itachi never needed to do that anyway, no one ever forced itachi into a corner, to go that far to protect his self by wrapping flames, around Susano'o which Itachi Never uses. Sasuke has shown a better use at using it, otherwise he would' be dead by raikage.
Darui said " don't tell me he's more efficent than Itachi with Amaterasu"
Efficent means making good use of something-