I like this theory. It explains the broken/cut ski pole found in the tent that I haven't read an explanation for yet.
I think the injuries could have happened at the tent actually. Maybe their broken ribs didn't immediately puncture internal organs, that may have happened later after a bad movement.
I think this might even explain the 8 tracks (and not 9). Maybe one of them - Thibo? - was so injured that he couldn't walk and they carried him down.
- Isn't it strange that the most injured wore the most clothes? I don't think they would be the ones to survive longest, longer than the Yuris next to the fire.
- The standing skis that Tenne mentions above... And the fact that the tent didn't move. Don't you think in a slab avalanche scenario the tent would be moved? Most of the force is lateral.
Here's another version: Could it be that the avalanche only caught Lyuda, Semyon and Thibo? As they are the ones with the severe injuries but also the most clothes, so they might have been outside, smoking, talking, looking at the sky, something like that. And then a slab fails near them... The others would dig them out and decide that they need a heat source to warm them up, and maybe that is the reason to descend? This doesn't explain the cuts in the tent though.
By the way not all are cuts, I have also been considering that some are from the ice axe damage by searchers, some are tears along seams by the wind in the intervening month between the incident and the search... In fact the ones that are certain to be cuts are mostly horizontal, but still that the edges show tear does indicate that they used the hole to exit through.
Also, I don't know if you know this but basically you arrived at the same conclusion as the official Russian investigation last year.