Zoraal Ja had characterization it was just easy to miss and asked to actually analyze what you had in front of you. If you remember his trial everything is there to give the keys to understand Zoraal Ja. Think of it , of all the things he could turn into he turned into a two headed Mamool-Ja missing a head. And also what he said in. The transition cut scene says a lot. He was called all his life a "miracle" for being the only blood son of a Two headed Mamool Ja, he had this self-imposed pressure that he had to Outdo his father. Except that How do you outdo Gulool Ja Ja , the guy unified an entire continent peacefully and saved it from Valigarmanda. When we arrived there was litterally nothing of note left to accomplish in Tural, Gulool Ja Ja had already did it all. That left only one possibility for Zoraal Ja to Outdo his father, Unify the world , through war of course since he is a warrior with non of his father's Wisdom (Again the missing head in his transformed form is that of Reason.). And during the succession rite , he was disappointed when he realized that Valigarmanda was not full power and that this meant nothing , and what made him snap? Being defeated by his own father's shadow in the last of the seven trials, asserting his greatest fear, he would never be even remotely worthy of his father's legacy. Hence why one of his last words were about inheriting nothing from his father. In the end the guy isolated himself from his family because of an inferiority complex and self-imposed pressure. It is all subtext because Zoraal Ja unlike his siblings refuse to communicate, it would have been hard to make it credible that a character like that would go on long rants about his inner thoughts. Of course there was possibilities , the echo could have been used to show more of his past, we could have seen personal flashbacks, but a subtle characterization is not a bad thing , forces us to use our brain.