Reframed with more standard pronouns: if I have everyone else in my power, but not myself, then everyone else is in the power of someone I don't control.
In that case, most powerful is she who has herself in her own power, plus the greatest number of other people.
(I opt for Eliezer's coin flip method of gender-neutral pronoun usage, by the way.)
Here's the new thread for posting quotes, with the usual rules: