Cannibals in region where Michael Rockefeller was killed and eaten

A book published in 2014 by Carl Hoffman claims that there is ‘clear and abundant’ evidence that Rockefeller made it to shore and was killed and ceremonially eaten by the  tribesmen. Their main crops are banana, sweet potato, and cassava. The hold sweet potatoes in the highest regard, and it is used for bartering, and even in taking a daughter’s hand-in-marriage.