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if kakashi killed rin because of the connection with obito,it means he can't always control it.i remember kakashi telling some1 that it is always active and that it being connected to obito is probably why it was always active and young kakashi didnt have his eye covered like the older kakashi and rins death kinda lead to the eye covering and is a secret from others.he just didnt realize it was connected to obito which caused the activeness of the eye(he has told) which exsplains kakashi's disappearing jutsu awakening.i wonder if it was kakashi or obito that awakened mangekyo?i wonder if obito saw alot of kakashi's life (battles etc.)