NO.

I give you a 0 on reading abilities.

i never said that Obito managed to achieve the Mengekyou Sharingan, i said that he tried Killing Kakashi in order to get it, at that time, Obito had 3 dots on his sharingan, and even though it's very hard to beat someone who mastered his sharingan, it's possible (if Gai could win against Kakashi, then so could Kakashi win against Obito).

should I simplfy it furhter for you, or do you understand?