Its rare to loose a front bearing and it looks like the rear did not let go in the pics as the wheel is intact. Oil for the bearings starts by being sprayed on the front then travels down the shaft to the rear. The rear being exposed to heat and end of the line lube lives a much harsher life.When you loose a rear it is shrapnel city. It is possible it was a front bearing failure-you end up with the same result-just different causation. I am just leaning to compressor rub due to the overspeed issue. As soon as the compressor hit the housing all bets are off as to what it is going to look like two seconds later. Hopefully Bob can do a postmortem on the can. Scotty