With respect to comments from FZ Pilots we as outsiders cannot comment on the F/O's roster and if it is fatiguing as the roster pre view is so small. Any sleep scientist commenting here wont mention the F word they will mention the S word = sleepiness = the need to sleep. I hope the Investigators talk to his wife and find out what he did pre flight. Knowing many Spanish Pilots they have a culture of being able to take afternoon naps so he may have been in a good position when reporting.
On hopes that FZ would have risk assessed the possibility of holding for 2 hours going round in circles trying to land at an airport in the middle of no-where at night. One can only suspect neither Pilot would have been able to nap.........
Lastly I hope Fly Dubai now look after the Cockpit and cabin crew families, keep paying their wages, keep them housed etc. If they try blame the crew without recognising their own errors and or the F or S word it will be a cover up for sure.
May they Rest in Peace