Also, I'd suggest thinking about this in a slightly different way to the way you're thinking about it. The only pirate in the scenario who doesn't have to worry about dying is pirate E, who can make any demands he likes from pirate D. What distribution would he suggest?

Edit: Rereading the wording of the scenario, pirate E can't make any demands he likes from pirate D, and pirate D himself also doesn't need to worry about dying.