Although the Autopsies leave a lot to be desired, I would have thought that if Rifle Butts or Human Elbows were responsible for some of the injuries then it would have been stated. Also I very much doubt that Rifle Butts or Human Elbows caused the extraordinary injuries to Dubinina.
The highest Soviet authorities gave orders that the investigation be closed with the conclusion that the whole tragedy was an accident. The local police was prevented from investigating the tragedy as what it was - murder. When the investigation concluded that Thibeaux-Brignolle had not been hit by a blow since there was no damage to the skin, it was a revealing statement because Thibeaux-Brignolle wore headgear and this ensured that the skin was intact when the bone absorbed the impact and the skull broke. This was murder.
The injuries to Dubinina's body are fully compatible with hard blows. Also, there is no other possibility. There were no avalanches.
Avalanches would not have caused the skull fractures of Thibeaux-Brignolle and Slobodin. Nor could falls.
The injuries to the breast cages of Dubinina and Zolotaryov could not have been caused by falls or any form of natural accident. Human attack remains the only possibility.