[quote]Why did we need a unique form to Goku?[/quote]
To make it have some importance. But not including it probably would be for the best.
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Exactly, it would have been much better if: A) SSJ3 didn't exist B) Goten nor trunks could be Super Sayain C) It was Piccolo who becamse majin. The great demon king piccolo rises again? It would have been great D) No majin buu. Make babidi and his terrifying magic be the main enemy, with dabura being babidi's fist