Although many do not enjoy the development that they gave to Dragon Ball GT, Toei Animation’s anime has many interesting things. The Super Saiyan 4 transformation is one of them.
This brutal form achieved by Goku, while facing Baby could have been executed first by Vegeta, but the prince of the Saiyans missed the opportunity. Because?
Vegeta always has an obsession to surpass Goku. However, he always falls behind the Earth-raised Saiyan. The first Super Saiyan and the third phase were achieved first by Roshi’s disciple.
Just in the Super Saiyan 2 Goku is not the first. However, that doesn’t give Vegeta number 1, as it was Gohan who was the first to reach this level. For the fourth stage of power of these warriors Goku he returned to the limelight, but certainly the Saiyan prince should have achieved it first, according to theories.
Why could Vegeta be the first Super Saiyan 4?
For those who do not remember the principles of this transformation, the Saiyan warrior who executes it must master the Ozaru.
What was happening? That since the arc of the androids in Dragon Ball Z all the fighters of this race cut off their tails. So, they did not know that after the Ozaru -when the Super Saiyan had already been mastered- there was a new level to reach.
Goku made it because he was transformed into a child for Dragon Ball GT. This caused him to turn his tail back, overpower the giant monkey that he carries inside of him and thus achieve Super Saiyan 4.
Vegeta had all these elements, but the fact of not having his tail prevents him from accessing this level of fighting first.