What if the person who drew Henry’s picture is the same one who made the book, and it is a character we will find out at the back half of season 3? Someone from Oz? So that’s why they can’t say, it is going to be a plot point, but just not one we will see all that soon. Also, if they get bad ratings this year (nooo!) they may do the second half of the season differently if they are worried it is the last year, than if everything looks good and they feel confident of running 5 for syndication.
It’s possible that the reveal will be in the second half of the season. Wouldn’t it be awesome if the Wizard of Oz was behind it all haha.