ExSp33db1rd,
With respect, your comments to MAS -- especially your last sentence --sound presumptuous; even a tad arrogant.
This discussion is not restricted to the boundaries you suggest; it's about a horrific crash (sorry, I don't like the word "accident" in this context). At this point there is no information available (publicly) that suggests DG as a cause. And the discussion re another crew member, or other mitigation suggestions to deal with onboard emergencies, is just one small aspect of the overall discussion of this occurrence.
(IMO) MAS's question and concerns re the safety and security of cargo ops are both valid and of interest. Many of us in this business believe that freight ops have been left dangerously far behind in the rush to provide increased security (both real and imagined) for passenger ops.
grizz