I know, my whole point was that bubble shield is not a default for him. However, Chief is a Hunter due to his personality traits and his physical traits. If you see him without armor he's relatively skinny, when compared to the Hulk looking Titans. You know what's really odd though? Hunters in Halo would be Titans in Destiny, same with brutes. Elites in Halo would be Hunters, along with Jackals. Grunts... Well I don't know. And prophets are Warlocks.