Very unusual. I have heard of timing tensioner failures here and there, but you would have heard it on startup, given your time with the driveshaft failure.

I imagine anything causing poor oil pressure (ie clogged pump screen) would have thrown a code before catastrophic failure.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth