Could it be that America has run out of undiscovered talent? Surely not - perhaps all undiscovered talent is unattractive, overweight or gay (all undesirable components to TPTB I'm guessing) so they can only let in a few undiscovered a season.

Ah, who am I kidding - The American television and entertainment business isn't that prejudiced when it comes to making money right?

Aw, man, we showed our cards too early. If Fox knows we know, and are just waiting to spill the beans the moment the first plant hits the screen, they now have ample time to fix their mistake and get the plants out of the competition. Don't let them know you know the identities of the plants and can prove their plantiness! It would be much harder to recover after they announce the top 24!

FYI, no way they could get rid of the "plants," because if they did, there would be no show.