I know I have posted before saying their injuries are not typical of an avalanche. Guess what, I've been reading more about this topic. Skull and chest trauma including serious trauma are the most common injuries in avalanches. Not the most common cause of death though (that's asphyxiation).
If the avalanche was at the tent, still doesn't explain how they got to the ravine. If the avalanche was at the ravine.... which I think fits the case better, then abandoning the tent is not explained.
I still don't really understand camping on the slope and especially "cutting" the snow to achieve a level platform. They must have known better. It makes absolutely no sense to set up the tent like that under any circumstances, let alone when the forest is so close.But then again I also have a hard time digesting the "staging" scenarios due to lack of motive. So that's an impasse..