What if I astblish that it's one of the powers of the main churturs? Will that make it none mary sueish?

Just wondering... What's the difference between this and Possesion Implies Mastery?

In the live action tv it should be cited that old '80 show, The Greatest American Hero, as an aversion. The protagonist lose the manual to his alien-gifted super suit, and pass most of the series trying to learn how to use it.