About MS... Itachi said that for the awaken MS you must to kill closest friend, but Kakashi showed, that this action isnīt neccesary to awaken MS but itīs faster way then train it like kakashi....I wonder sasuke has MS which donīt killing him like Itachiīs... and poor kakashi

I read in naruto wiikia, that kakashi knows the danger of much use of MS.
Normal Sharingan.... Obito case: I can see clearly here.... Obito wasīt able to awaken Sharingan, because he was relativeli in safe and only Kakashi always saved him so Obito canīt awaken Sharingan until Kakashi was in problem.
the same Sasuke
Itachi awakend 1year after academy... probably to save his team mate.