Don't wanna explain much
You see how Sasuke or Madara got his with taking there brother eyes you will have EMS. If you only have one eye I think the other person will not have it because he didn't change eyes.
Kakashi somehow got MS when Obito unlocked which seems kinda farfetched
You need the eyes of a closely related Uchiha's own Mangekyou Sharingan to be implanted into your eye sockets, and if there is no blood relation with the Uchiha, then that cannot happen