Sick, I dunno where you're coming from if you think DHL have any obligations to ACL beyond the legal ones in the contracts that, as far as I am aware, gives a 90 day termination clause on the use of the aircraft. I don't know the details of the Management contract for the EAT owned A300's but I would guess that they also have a similar 'get out' clause.
Where you get the idea that there is any legal obligation to the ACL employees I have no idea although I will readily admit that my knowledge of Irish, or even EU, law is far from complete.