Think about it for a minute, why make DBZ Kai and the new Dragonball Z Movie and have new art style? They also had the film "Goku and Friends return". It seems like they are releasing these films to fill the gap before the next series can be finished and released as I imagine doing 100 episodes would take a long time. What do you think? After all The DBGT film with kid goku shows adult Goku is still alive and still able to join in any fight for earth so it's really easy to bring him back.