Not a pilot, just trying to understand something. Would the hours referred to in the report (98.9 and 89.7 respectively) refer to DUTY hours or IN COCKPIT hours or FLYING hours (defined loosely as, say, hours in cockpit with engines running).
If it is duty hours (from when arriving at place of work until leaving place of work), then:
1 - if half the 30 days were non-duty days this averages to 6.7 duty hours per day (based on 100 hours). This would not sound like an overworked person, only working 1 day in 2, and only for approx 7 hours a day.
2 - if this was compared to 'the average worker' (whoever that is) working 5 days on, 2 days off, then there would be a maximum of 20 duty days in this 30-day cycle, which equals 5 duty hours per day. This also sounds like a reasonably non-overworked person - working 5 days in 7 for an average of 5 hours a day.
Now averages are misleading - given, but I am trying to understand the basis for comments like "... fatigue has to play a part...."
If the hours cited are actual IN COCKPIT hours (and not DUTY hours), what is a reasonable estimate of the actual DUTY hours these pilots may have done in the past 30 days?