l Sasuke Uchiha l
Member
Sasuke was looking for Itachi, we don't know it the sickness would have killed him at the same day, as he had lived for so long on share willpower. But the damages and physical drains that Itachi had to deal with under the fight made him even weaker and that is the reason the sickness killed him. His body was so weak after the use of all the jutsus and MS abilities he used.First part of your reply I don't agree with it , itachi told sasuke to come and fight him cuz he knew that he would die. Sasuke didn't give itachi any killing blow just few burns only if sasuke didn't come that day itachi would have been dead.
Second and third part I agree except on the fact that he was able to master them by using his eyes not a completely self work.
If you mean that he used Sharingan to master the Chidori then that is because the Chidori can't simply be used without the Sharingan. Well it can be used, but not without major risks, commented by Minato.
Sasuke mastered the Firestyle jutsus at a Genin level, even Kakashi was surprised. Sasuke mastered high level Ninjutsu at the rank of Genin! He mastered Fire Style without Sharingan!
Sasuke also awaken the Sharingan long before becoming a Genin, which is quite special too.