It appears that Bram and Ilana have a lot of knowlegde about the island. Ilana even know Jacob by herself. They 'probably' knew that this Blacky Guy can take a form of non-buried people so... If they knew that there is possibility for him to take a form of Locke, why they didn't bury him? Is the Real Locke body was soooooo important to show it to Ricardos?
What do you think about it? (or maybe they didn't knew?)