Flying bean,
Thanks for the details. I would tend to agree with your analysis in which the major oil leak could have been the start of the separation of the prop (and CS governor?).
In my view, as previously said, an oiled up windscreen is certainly the cause of the failed emergency landing. I don't know the terrain where he attempted to land but what is sure is that it trees were present, it would have been very difficult to manage to avoid them with no vis.
Do you know whether the prop separated with the governor or by itself?
Regards
ZS-NDV