NPCs do not universally come in wings - indeed, wings of more than 2 are rare, even in HazRes - but I do not expect multicrewed NPCs to similarly be rare. More importantly I see nothing mentioning that you cannot combine the two and end up with three NPCs, each of which has triple DPS (three fighters) and double resistance.
Ohhh, I misunderstood your question. NPCs won't have additional crew members.