I don't like the idea of preempting the auditions much will wait and see what the list of finalists looks like before i throw my bets on somebody.
As far as Cuca goes while my heart melts when i watch her do her little dances my head says she's far too young to handle the hectic scheduale and demands to be a Morning Musume member. She's also not very well developed singing wise so if they want to do something with her i think they should train her for a year and then see how she develops. Right now too young and too inexperienced. Even if she is adorable.
And for the sake of the coversation The egg/whatever they call them now i would pick even though she's new to the program is Uemura Akari she has a great look and would likely be able to adjust and be trained quite quickly. But that's me going on a look and my own intuition since i don't follow Eggs closely to know how well each one is developing.
As far as Karin goes it seems like people just want to see her do something lol. Doesn't mater what. First they wanted her in S/mileage then Morning Musume when the wild rumors that she would be a surprise member for 10th gen and then they said she should be a soloist and not in a group. Now we have a Morning Musume audition announcement and they want her in Morning Musume again.