Choose a leader when copying the Courtesan's Guild with Olympia (B)?
On boardgamegeek.com, Jacek Deimer says he has asked Antoine Bauza, the author of the game:


  Can I chose new leader for the copy or am I forced to copy leader that already has Courteasan Token on it?
  For example: I copy CG that copies PLATO, will I have to copy PLATO again or can I copy different leader?


Antoine's answer:


  You can copy any Leader from your two neibhourgs


So, {Variant 1} would be correct.

(note however: there is no source to verify that statement)



Here is a statement by a Éric Franklin (credited for "Revision" in the rule book) confirming that the interpretation described in {Variant 1} is correct.



Update (2013-02-18): Repos Production published an official FAQ, containing this question:


  Q: With stage 3 of Olympia’s B side, I copy the Guild of Courtesans. Do I then need to copy the effect of the Leader where the Courtesan token is, or do I get my own virtual Courtesan token which I can use as I want?
  
  A: You get your own virtual courtesan token.