What I was driving at was that there was a shaft (bevel gear drive shaft) in the MGB that was no longer connected and the exact position of the bearing supports isn't present on the schematic. It had failed below the bevel gear (the bevel gear was still connected to the shaft above the failure thank goodness) and in dropping, the lower part of the shaft had damaged one of the roller bearings and the gear teeth of the pumps. However, you are quite right that this may not have caused a further failure as all the debris was no longer being circulated by the oil. I just don't like the thought that the shaft that drives the whole thing had even the slightest potential to fail without other cause and we are then in the realms of experimental engineering. EC obviously have used this technique when it comes to the design and test of the Emergency Lube system as it was never fitted to a complete system before entering service.
I fly 'em as well but not every working day...