If someone gave me all the evidence but didn't tell me why they left the tent or the condition of the tent, my first guess would be that it was blown open by the wind, since in the diaries it was noted that the stitching where the two tents were sewn together to make one would come apart under much better weather conditions. A reconstruction of the tent, pitched in the same location, with the same orientation, under the same weather conditions might really help, and yet the recent official investigation didn't do this, which makes no sense to me.
And notice that in the statements by the rescuers presented on this thread, there is no mention of this being two tents sewn together (unless I somehow missed it). Two things come to mind, one being that the tent may have frozen up quickly (at least where the stitching was), because if not, the stitching should have been coming apart and been noticed by at least one of the original investigators/rescuers. The other thing is that one has to question their "powers of observation," not noticing or mentioning that this tent is actually two sewn together.