All he had to do was crank one engine now and then....run the heater....and WAIT till Day Light. He could have taken his NVG's....and perhaps that might have made a difference no matter the poor lighting.....he could have fired up the NightSun and hover mosey'd down the mountain side to decent weather....any number of things he could have done that would have altered the outcome.
All so tragic.....good intentions getting in the way of good thinking!