Flying Bean there may be a few inconsistancies but I think the still believe that the loss of the prop will be the first problem which was then compounded.
Try looking at it this way:
5.8nm from prop to crash site1
C210 glide speed approx 85kts(if i remember correctly)
= approx 1.5nm/min =approx 5 mins to impact
oil leak followed closely by loss of prop
change in Cof G
massive vibration
engine fails
no forward vision due to oil leak
loss of A/H (if vacum type)
pilot struggling due to rearward Cof G possibly leading to overcontrolling
great difficulty in find open space to land
All in All it would seem that the pilot had very little chance of a successful outcome considering his experience, i very much doubt if even a much higher level of experience would have help him either.
I think you have to look at maintenance as the main area of investigation as I very much doubt the pilot had much going in his favour in this situation.