The fight against Goku Black not seeing any Super Saiyan 4 in it is less egregious of an example. While Goku uses the base Super Saiyan forms to face off against his evil counterpart initially ...

bringing back Goku’s tail and transforming him into a Super Saiyan 4. On top of this, Goku and Vegeta becoming Super Saiyan 4s in Dragon Ball GT saw them both still sporting their black hair but ...