Final answer:
Ongka is recognized as the leader of the Kawelka for his wealth distribution, sponsorship of feasts, assistance with bride wealth, and his service to the community.
Step-by-step explanation:
The tribal "big man" Ongka, portrayed in the documentary "kawelka: Ongka's Big moka," is recognized as the leader of the Kawelka mainly because of his ability to accumulate wealth and to distribute this wealth equitably within the community. Ongka's status is further enhanced by his sponsorship of feasts and assistance in helping young men pay bride wealth. His power is based on persuasion and his service to the community, setting him apart in a society that values generosity and loathes greed and selfishness.