They may not have being trying to help their stricken friends but rather trying to help themselves?
There were no signs that Zina, Rustem, and Igor made any attempts to keep warm by putting on clothes of their dead friends. And this is the first action (in my opinion) to help themselves. Especially before starting a long climb against the wind. If you will say that those 3 hikers decided to leave their struggling with frost but still alive friends and switched to helping themselves, it looks like desertion and is in contrary to their group's spirit.
I also don't think they would be exhausted by covering 1.5 km up or down , that's only 3 km and is nothing to any average fit person. Moving in the cold would help.
The fact is that all three did not manage even 2.5 km. If they were not exhausted, how would you call that?
There in lies the problem. We would think if anyone was going back to the tent , they would take the boots of the hikers at the very minimum , even if they were still alive. So, Igor , Zina and Rustem don't take the boots to help them back up the slope ,( if thats what they were doing) , there is the possibility that they couldn't get to the ravine four as this is where a potential snow cave collapse happened.
Or it could be that their hands were just too frostbitten and dysfunctional that all feeling had gone. I would expect the loss of hand movement within a couple of hours in poor conditions but this is variable . At least one of the hiker's had gloves but wasn't wearing them when found, again this suggests they didn't lie down and then die in the cold, it suggests that they died whilst doing something and when they died no one else searched him or used his clothing . It suggests that they're clothing couldn't be utilised by any survivors and that the ravine 4 weren't utilising all of their own clothing.
You missed this bit from my post
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If there was further accidents like falling in the ravine, out of the tree, or snow collapse at the den/ravine , those left alive have no other choice but to try to regain equipment from the tentIf I,R and Z were the last alive then it is not desertion .
To take refuge in the forest , start a fire and build what is at least the start of a den with flooring , shows intention to survive. All the activity found suggests this . It shows they moved as a group , and it shows collective work by the group by means of the only tools and resources they had. If we were all asked for two things we would expect to do in a survival situation in winter and cold we would all say fire and shelter. This is exactly what we have .
As to why i wouldn't call it exhausted, is its not the activity or distance that cause the exhaustion but the cold . ( Its also meant to say" moving in the cold wouldn't help", not would) .
Even if we have rockets , fights , tree's , avalanche's or whatever among the group as the reason for their migration to the forest from the tent, at some point they would have to get back to their only chance of survival,that is the tent and its contents . To sit and wait is death.