1. That all chest fractures occurred before death.
Unless the pathologist took samples of every single fracture point this cannot be known with any certainty, only for those he took histological samples which then showed microscopic cellular activity indicating the healing process had already begun (which happens near immediately but takes 3 weeks to be big enough to be seen on x-rays).
Perfectly possible that some fractures occurred after death, which would also help explain the lack of bruising, caused for example by deer, the males weighing up to 45 stone, walking across the bodies on the floor of the ravine when there to drink, perhaps when the bodies were partly covered with snow.
2. The Mansi males were all ill at home, apart from an ageing Friar Tuck, so cannot be involved.
This may be the truth but it always sounded to me like a convenient alibi for the others, one the women will automatically verify, while inferring that one portly older male could not pursue and overwhelm 9 hikers, even if he was armed. I don't think the Mansi harmed the hikers, but I think it possible they found the tent and bodies and then, fearing the blame, played it as though they were never there. As such they may have confused the mystery by overwriting the scene of the hikers deaths.
This then explains the torch on the tent and how 1950s zinc oxide batteries miraculously lit it after what would otherwise have been 3 weeks exposed to the elements, the diaries all inside one rucksack (a patriarchal/cultural thing, they probably didn't understand the girls wouldn't want to have, or be permitted not to have their diaries in a communal library), the downhill footprints if made by shod feet (9 being a Mansi hunting party number, as 9 once froze on Otorten, and they would not ski down 1079 as the snow cover then exposed too many rocks), the 'Mansi belt' by the cedar, the Mansi material towards the den, and the turning of some bodies after death.
Assuming the Mansi could read the diaries they may have placed one older Mansi out there, resistant to interrogation, after reading how the hikers were following in a deerhunters recent tracks, singular or plural perhaps unclear.
3. The hikers had been fighting, suggesting that unless they fought among themselves a third party was present.
This web site, when I last checked, suggested in red that injuries to the metacarpal joints are typical of fighting. In close-up Igor Dyatlov and Rustem Slobodin's hands, their leading hand knuckles, do not have any broken skin or notable swelling, and the pathologist did not suggest they had been fighting, he merely recorded an observation of some reddened areas. Erythema is common to the knuckles. Indeed Igor's brother had it to his right hand's lower knuckles in a UPI classroom photo. I doubt the diminutive Dyatlov brothers were known to be a bunch of scrappers.