Rod Bearings are Done :(

Let me back up a bit. Sorry to hear this happened. What a pain huh! Your photos are a bit blurry so I can't quite make out the chunk of metal is or how big it is. Did you ever figure out where the antifreeze came from? Almost any in the oil will wipe the bearings out. If the bearings are grooved there is a good chance your crank may be too. If the crank isn't hurt too bad may be it can just be polished and the correct bearings installed. I would still be suspicious as to where the coolant came from and what all the metal is about. Lots of unanswered questions.