I heard on the BBC that the reason all the Sherpa's where on the slope when it happened was because of an American reality tv show. Will have to look this up. Imagine the BBC doing a better job of journalism than the U.S of A!!!
Discovery had a team up there to document a wing suit diver who was getting acclimated, and was to summit then dive off the peak. It was basically pre climbing season, that is why so many Sherpas were in the same place at the same time, along with cooks and other camp personal.