On this BizTalk Glossary Page it states that a zombie ressurector is: An orchestration that listens at the MessageBox database for zombies and resurrects those that meet certain criteria.
The previous definition of a zombie is: A message that was not processed by an orchestration. It is not in the Suspended queue or anywhere else where it will be retried.
If there is an orchestration that is looking for ‘zombies’ – then they were never zombies were they?
Once you have answered that, then you can answer the question of which came first, the chicken or the egg?