Bismarck.Josiahfk said:
»or she begged him to kill her because she knew what it would give him and she was about to die anyway etc.
Some crazy twist to explain it
Yeah right because they are barely teenagers and they know how to unlock MS lol... At this point Kakashi probably doesnt even know what MS is.
I would actually risk theory that Kakashi never used MS till he was older because he havent known that he awaken it when he killed Rin. He maybe felt something changed that day but till he found out that something like MS exist he havent even known he could have use it.
PS. Sorry for grammar but I dont use past times a lot :D