Get a raider or venom that takes up a fast attack slot in the Dark eldar. You can start the game with any battle brother in it.
If you get one as a dedicated transport, for lets say Kabalites, no one can start the game in the transport except Kabalites. After the game has started you can put one of the heroes path models into the raider. But any battle brother can get into any transport/dedicated transport.
15,000 Dark Eldar