[Aerkuld]

Is it a twin row tapered roller bearing and is that one of the rollers sitting on top of the casing in the individual photo?
Was the damage visible caused by parts of the bearing itself or was there some nasty introduced to the bearing possibly via the oil feed?

Certainly the bearing has siezed, spun in it's housing, and probably dropped a roller. I'd guess that dropping the roller probably freed it back up due to the additional play which caused the shaft to run out-of true, probably lost control of it's end clearance and ran whatever the titanium part mounted to the shaft was into the nearest immovable object.

But that's just a wild stab in the dark...