I think so, maybe I just assumed, I'm not sure if it's explicity said that those are the only 3 members of the jury. I'm guessing that the quality of the book would also be a factor, maybe even the genre (historical easier to sell than sci-fi for example).Is this already known?
I theorized you can influence the judges, depending on how you dealed with Seymour, Minerva and Victor (read Hollys book, published his co-workers book).