Incidentally, this is the only visual sign that this was a bad U-joint - you can just see some of the silver of the bearing surface, which is ribbed from the needles wearing against the surface, before they all fell out, sometime several months ago, at least.
This would have been almost impossible to see with the driveshaft installed.
This is the read U-joint - the front U-joint and the center bearing both appeared to be fine.
- Eric