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Edit: just realized you had another thread a few days ago answering some of my questions so disregard my post where necessary.
Sorry to hear that. How confident are you in the engine failure diagnosis? Do you have any photos of the bearings showing catastrophic failure or the type of particulate found in the oil filter? How many miles on the car and what year is it? Have the rod bearings ever been replaced?
It is plausible that the plastic vanos spring retainer cap broke off and was subsequently ground up into small pieces that blocked the oil pickup tube in the oil pan, which caused a lack of lubrication (such as connecting rod/main bearing damage, etc.) and led to engine failure.
The interesting part for me is that you drove the car into the garage normally just to fix a valve [rocker] cover oil leak only to discover complete engine failure. Normally rod bearings that are spun or damaged badly gives you other warning signs such as rod knock. Either you caught the earliest signs of rod bearing failure just before the engine shows obvious signs (knocking noises) or you might not be in as much trouble as you are thinking.
Worst case scenario if you do need major engine repairs, it's generally easier to buy a used replacement engine (long block), and then replace rod bearings/vanos caps before installing the engine as preventative measures. Rebuilding an existing engine opens you up to many more potential quality issues.
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