There is already a fairly public "paper trail" of fatigue reports on the RT link. Of course, with FlyDubai being Govt owned that will probably just "evaporate". Nonetheless, a decent solicitor could make a very big case against them if someone engaged him/her. I won't speculate on the cause ( I have flown 737 long enough to know "her" foibles & to understand my own human weaknesses when dealing with them) but, a decent legal honcho should assuredly destroy the little scrotes who run the flt ops Dept with no regard for the health/state of alertness of their employees having ignored multiple fatigue reports over the years.