I'm not surprised that Vincent is leading, like Capo de La Cosa Nostra said it could really tarnish the GF1 and GF2 to see characters portrayed in new ways.
I personally would love for it to be a prequel so I voted for the first choice, but in truth I don't think it could be done well. So if it were a book only I would say prequel if they do make the movie I would think that they would have to make it Vincent era.