Ok thanks for the help, Jarrfan!
I will adress your thoughts from before about injuries in this post and then get back to the question of the damage to the tent in the next post.
The Dyatlov mission by Josh Gates and Teddy near the same conditions as the hikers showed abundant snow covering the rocks and a smooth top layer. Even though there are big rocks underneath, it does not appear they were pronounced enough during the winter to cause such injuries.
Let's start with Slobodin who was found between the tent and the cedar (on the mountain slope). His body was positioned in the direction of the tent, like the other two found in the slope. This has been interpreted as all three could have been trying to get back up to the tent from the cedar. There is no way of knowing for sure.
Establishing that each and every rock or stone between the tent and the cedar at the time of the incident were beneath a thick layer of snow is a tall order. One single rock (or one lose stone of sufficient size set in motion by a strong wind down a slope) is enough to crack one head.
I don't know if you're interested in mountaineering, but if you are and have read a bit about it you'll know that cracking your head on rocks or getting your head cracked by loose stones arent exactly uncommon ways to die in the mountains. I'd say under Occams Razor if you come across a body with a cracked cranium in the mountains those are your usual suspects.
What I mean to say is that it really takes quite persuasive evidence to rule it out.
But that aside, as to the conditions in the slope at the time, here is a picture of the tent in the direction of the tree line which appears to show exposed ground with limited snow cover, and what does look a lot like rocks (although it is hard to know for sure just from the photo):
As to the injuries of the ravine four, they likely died by falling through a hole in the snow cover caused by a stream of water 4-5 meters below. This is a danger which any beginners guidebook about trekking in the wintertime will warn about. They were found face down in a stream, on rock, with fall injuries. When they fell, they dragged a bunch of snow along with them and on top of them, and then heavy snowfall buried them in more snow the following months, and that's how they were found.
If the hikers were so disoriented and frostbitten as to stumble around and fall numerous times onto the snow, how could they have made it to the area of the den, built the den? The group by the cedar tree made a fire that apparently burned for at least 2 hours before going out. This does not speak to a blizzard wind so fierce as to disorient the group.
The first thing to recall here is that the wind in the slope on the open mountain and the wind inside the forest below the tree-line are two completely different things. True in any mountain terrain, but also attested by a number of witnesses for this specific location. (By the Dyatlov group themselves in the diaries; by several of the rescuers at the time, and in later interviews; etc.)
So to say that the wind could not have been absolutely violent and punishing on the slope at the same time as it was possible to make a fire by the cedar tree does not make sense to me at all. They came below the tree line to the cedar tree to escape the wind. They built the fire on the side of the cedar tree that was further protected from the wind by the tree trunk.
As to what state of hypothermia and frostbite each person was in and when we have to look at each case individually and keep the timeline straight. The conventional understanding (although it's not clear to me if this is proven, or informed guesswork) is that all the members of the group exited the tent and came to the cedar at first.
The yuris seems to have succumbed to hypothermia there and it is often conjectured that they succumbed first, so presumably they were in worse shape earlier. Maybe they were the least well equipped; or maybe they exhausted themselves and got frostbitten working to build the fire and break off branches from the cedar. I believe their autopsies showed a lot of injuries that were consistent with being caused by trying to perform those activities with frostbitten hands. (I've also somewhere read some witness report that they found the trunk of the cedar smeared with the skin, flesh and blood of the deceased that they left there when they were working desperately to start the fire. I'm not sure how reliable that claim is though, I think it was made in an interview much later. But it wouldnt surprise me if it was true)
For the three found in the slope, if we accept the conjecture that they expired while trying to get back up to the tent, then they might have been in fair shape while at the cedar (all three were fairly well dressed). In fact, they may have been chosen or volonteered to attempt the tent exactly because they were in relatively better shape and better equipped.
But as soon as they started trying to travel back up to the tent they found themselves walking in rising terrain and face-first into the wind direction, instead of having it in the back. Needless to say if the condition is 30-40 degrees below zero celsius and wind speed 20-40 m/s with wind gusts above that, it was suicide. They could have started out fine and been severely frost bitten and afflicted with hypothermia after a couple of hundred meters. And even if they were not it's perfectly possible to slip on ice and hit your head on rock by accident just from the wind darkness and bad luck. This, the above, pertains to Slobodin and his cracked skull.
The ravine four: since they succumbed to an accidental fall through a hidden hole in the snow cover in a ravine, it is immaterial how worn down they were at that point or what the windspeed was at that location. But it's likely that the wind situation was much much better. After all, that's why they were further down the trees towards the river - to escape the wind. One possibility is that the ravine 4 successfully survived the night, maybe in a dug bivouac ("the den") and then in the morning they got up to venture either to the tent or to the labaz, but immediately slipped and fell through the hole. Then died from their fall injuries and hypothermia induced by the water of the stream they ended up in.