Umm.....

It is the solemn duty of the Ferret Brain to flit about amongst the Militia, causing mass halucination and/or common thought. About nipples.

Bloody Harry Vane was described thus by the test:

Every pirate ilives for something different. For some, it's the open sea. For others (the masochists), it's the food. For you, it's definitely the fighting. You tend to blend into the background occasionally, but that's okay...because it's much easier to sneak up on people and disembowel them that way. Arr!

When you're the collective brain of a group like this, who needs offices or other affiliations?