It was definitely the two Yuri's that climbed, they found their skin on the bark of the tree. Speculation was they climbed the tree to see the area of the tent and see if it was "clear." The fire burned for approximately 2 hours so they must have used more brush or dead wood from the area. There was a remark that there was suitable firewood around the area and the searchers wondered why it was not used instead of the cedar tree branches.
As I said, the tent only had the 3 cuts made in it horizontal and semi circular. The big cuts came from the ice ax as the searchers hacked into it. So the hikers had to have left through the door. If they left through the door, what was the rush that they could not have put on proper clothing? This is the part that is unanswered for me.
As far as the ravine 4, it is possible they fell onto rocks at the ravine, but why were they all separated in the first place? The ravine 4 had such serious injuries they could not have navigated the way to the tree and den in the condition they were in, so they either fell or were pushed into the ravine.
The 3, Dyatalov, Rina and the other guy, must have been at the cedar tree because the den was only made for 4 persons, not 9.
I believe they were separated or forced to be separated and interrogated which is standard procedure in most police investigations to separate and question, and get to the truth. This is speculation on my part.
So the ravine 4 were left alone at the area where they made the den.
If there were lots of rocks visible, this would speak to the reason why there were no snow footprints of any other persons or animals.
I also mentioned in another section the "false" crown Semyon had when his body was exhumed. That is a very strange thing to have a vacant crown. In the 50's and 60's spies were usually given a breakable capsule of cyanide or strictnine in case they were in a situation where they needed to kill themselves. It is possible that vacant crown was there for that reason. There is historical evidence that several Nazi officials used a cyanide capsule after being arrested for war crimes and used them after they were captured. It was a way to hide the capsule. Just another unanswered question.