Jason Momoa talks to Yahoo about his new passion project Chief of War and how Aquaman helped make it possible. (Photo illustration: Aïda Amer for Yahoo News; photo: Samir Hussein/WireImage via Getty Images)Jason Momoa hadn't always considered himself a betting man, but in 2014 he went all in on himself. By the time he was cast in the titular role of Aquaman, the superhero film had been in development, in one form or another, since 2004. Many in the industry had written it off. But Momoa knew the risk could be worth it.