One of the elements of Dragon Ball Daima that had a major impact was that the series is a direct sequel to the Majin Buu arc. This immediately poses a problem for the series' canon, as Dragon Ball Super, with the arrival of new gods like Beerus, also takes place around the same time.
So, with the appearance of new transformations, such as Vegeta’s Super Saiyan 3 or Goku’s Super Saiyan 4, many wonder if the series is canon.
It is completely understandable. In theory, these transformations occur before Super Saiyan God, Blue, Ultra Instinct, and Ultra Ego. How do we explain that the forms that appeared in Dragon Ball Daima were not shown before these? Only time will give us an answer.
For now, as all Dragon Ball fans will know, Akira Toriyama is not very interested in explaining plot threads so that everything (within the fiction) makes sense. The Sensei would sit down to write and illustrate, and the result that remained was the one that came out.
However, Dragon Ball producer Akio Iyoku decided to give an explanation of why Toriyama decided that this new anime would be a direct sequel to the Majin Buu arc.
It was necessary to explore Buu’s origins
According to what the producer explains, Akira Toriyama felt the need to explain the origins of everything related to Majin Buu. This includes the monster itself, Dabura, the wizards Babidi and Bibidi, the Supreme Kai and his race, and the Demon Realm, from which Piccolo also comes.
The Sensei saw something in that universe that called him to explore the place and left us with this 20-episode work of art.
“Toriyama personally wrote the story, and it is directly connected to the Majin Buu saga. We wanted to highlight the connection between the events in the series. We are not introducing new ideas randomly, but discovering elements that already existed in the world of Dragon Ball,” said Akio Iyoku, as reported by Alfa Beta.