Who is South American friends from The Testament and what is their importance?

Valdir was the lawyer who acted as a intermediary between Josh and Nate. As Josh could not be in two places at once and was unfamiliar with the practice of law in South America, he contacted Valdir and requested his help. Jevy was the boat captain hired by Valdir to escort Nate safely through the Pantanal. Welly acted as both the deckhand and cook during their journey aboard the Santa Loura.