Well, let's go over the legendary Tsunku audition surprises:
1st Gen: The runners up got a chance in the first place.
2nd Gen: ???
3rd Gen: Picked one new member intead of two.
4th Gen: Picked four new members instead of three. (Tsuji)
5th Gen: Picked four new members instead of three. (Konno)
6th Gen: Picked all three finalists.
7th Gen (1st attempt): Picked no one.
7th Gen (2nd attempt): Didn't announce how many members he was picking, then picked Koharu without training camp.
8th Gen: Didn't announce how many members he was picking, then picked Aika, later added two members from China
9th Gen: No announcements yet.
The last few he hasn't even announced how many spots he was going to choose for.
Maybe he just got wise to announcing his plans ahead of time since he knows he's probably going to change them anyway.