Like I stated, it wouldn't be the first time it has happened. Lalafuto III faked his own death to get away from his role as Sultan of Belah'dia. Nanamo has left Ul'dah before under a disguise as Princess Edvya did before her. History tends to repeat itself. So it's not like the writers are destroying any of the plot if anything they're giving a nod to their own history that they have created in this game.
The Niellefresne connection is probably the least likely but it's a base I wanted to get out there because if it does happen then at least some people will have a bit more knowledge of who the guy is/was. It would mean a bit of closure to the 1.0 Ul'dah story line that still hasn't been completely finished and Ferne has said that things would come back, F'lhaminn did eventually.
None of what I said is probably remotely true but it's always fun to speculate/theorize with the current lore/history we have that runs back thousands and thousands of years.
