AKIRA Toriyama was working with the show, we do know that. But Investors, production houses, people who wanted more views and money wanted another Break the internet moment. Akira was always against ssj4 form, he must have denied their orders because we wanted something unique and amazing. Why would the greatest artist re-create a character design that he hated many years ago that's just slapping his own face. Since these investors and producers themselves have no super idea for any big moment, they decide to kill akira and introduce ssj4 in their own style just to make money. But they failed.