It appears that everybody's off on a slag off the otherside trip. The question originally set by JB. was a simple one, set to hopefully get views from allsides, whatever those views maybe. It seems to me, and it's only my opinion, rostering, have to look all parts of the whole, and try to cover all eventualities, Pilots (no offence gents/ladies)tend not to see the whole or the pitfalls,and look for a good, stable roster, which is not always possible. This is where it falls apart. Some Pilots are able to see 360 deg' but in my experiance these guys are not the norm. Trying to get the right people in the right place is the trick. Let Rostering, Roster, Pilots, Pilot, and input from Training, and senior Pilots where applicable.
Just my opinion...
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Not all those who wander are lost;