Usually in my experience, a cone SG starts with the cones bottoming out and no longer is a SG. With high HP and burn outs spinning only one wheel, the small spider gears start creating so much heat they weld themselves to the shaft, which in turn causes the shaft to spin, shearing of or breaking the pin holding it. With continued use, the case where the shaft sits, wear the hole bigger. In this case it looks like a foreign piece got in there and ground up everything. Maybe a gear tooth that broke. When we find the black box we will know for sure. lol
