In this case even with their permission, because it facilitates a breach of the pooling agreement. If Pirate negotiates a private settlement with one of those people, that defrauds the others out of their agreed upon share of the payment by Pirate on that debt.
Even if an agreement would have existed, it would have been broken with the first sale of an account. It doesn't really matter who buys BS&T/PPT accounts. Any sale removes the current account owner from the queue list in exchange for a financial gain. So if you need to mark someone as a fraudster for whatever reason, you would have to mark everybody who offered, sold and bought accounts. Amongst those are some of the forum's big/respected posters. Those accounts are in some way pretty similar to GLBSE shares, so you would need to mark those traders too.
Payb.tc has stated before that accounts will be paid in a FIFO manner: oldest accounts first. If it's Pirate or Payb.tc who pays back doesn't really matter. If you look around, many already linked their accounts by posting offers here in the forum.
Edit: fixed misleading typo