Sometimes there are reward challenges that involve spending a day with the natives to learn how to cope. Jeff has said that food was so (relatively) plentiful that it wasn't, or wouldn't be, the problem it had been previous seasons. Rainwater availability certainly wasn't a problem in Samoa. I guess with all the recruits they lack people who might have pondered how to manage in the wild. This might be another reason Shambo is kept on at Galu in spiter of her Gallagher tendencies, assuming she shared her skills with them the way she did her times with Foa Foa.