Just looked at this video:
http://www.bbc.co.uk/news/world-europe-32073318
It's pretty damning, if the co-pilot was having a health issue he would not have had his finger holding the switch down to lock in order to prevent the pilot from opening the door using the emergency override code. Since the aircraft was in a fairly controlled descent then there wouldn't have been any turbulence or G-forces to disable the pilot, so he would have had the opportunity in those eight minutes to use the emergency code.
What a selfish.... I'll stop there.
EDIT: It's also been discovered that the autopilot was set from 38,000ft to 100ft:
http://forum.flightradar24.com/threa...re-dat?p=64616