Since the universe of Dragon Ball introduced fusions in their storiesthe fans and the writers of the adventures themselves began to play with unusual combinations that we may never see in the canon of Akira Toriyama. One that was about to happen and at the time was seen as something funny or filler, could have advanced the Super Saiyan Blue.
What is the powerful transformation of Super Saiyan Blue about? This form appears during the Frieza Resurrection movie (and subsequent arc).
The Emperor of the Universe arrived repowered to represent a new threat after his new transformation: that of the Golden Frieza. So, the Z Fighters needed a new form that was capable of defeating the villain.
The start of Super Saiyan Blue occurs after Super Saiyan God. The assimilation of divine ki, combined with the traditional transformation of yellow hair and blue eyes caused this powerful new form to be achieved.
Thus, both Goku and Vegeta were able to stop Frieza’s intentions. Since then, until the appearance of Ultra Instinct, the transformation of Super Saiyan Blue began to be common.
It was used by Kakaroto, Vegeta, the fusion between the two and Future Trunks in the Goku Black arc.
Could it be advanced in Dragon Ball Z?
This transformation of Super Saiyan Blue could have happened in Dragon Ball Z if the planets aligned.
In the Majin Buu arc, the villain who had already absorbed Gohan allows Goku to fuse for a higher-ranking rival. So, our hero begins to imagine possibilities and in that he meets Dendé.
The panorama is painted and even how the shape of the final warrior would have been. After all he doesn’t, but if he dared he would have assimilated the divine ki that Dendé has for already being the Kami Sama of Earth and therefore there was the possibility of becoming Super Saiyan Blue.
We know that these theories are conjecture and imagination of those of us who are fans of Akira Toriyama’s work. It probably wouldn’t have happened, but we love playing with these kinds of situations.