sure grip questions, pics inside

Looks like someone barely saved it and temporarily at that.
The marks around it are from the pinion either getting loose or losing the bearings and it let the end of the pinion gear hit the carrier.
The welded spots are where the cross pin for the spider gears is.
It probably got all sloppy in the carrier so they welded it in.
This is the stuff I see in the pics, and who knows what was done to it on the inside but I can tell you no one will ever be taking that one apart or fixing it.

A pic of the open side might help.