People assume that Asura didn't fight his brother alone. They think that he had a army to help him. That wasn't the point Hagorama was trying to make. In fact what he was trying to say was that he initially needed help during the war. It was through the bonds he forged and hard work that his chakra blossomed and he gained power equalling his brothers. there fight came after the war Hagorama spoke of after he named Ashura his successor. 




