tallfarmboy
ArboristSite Guru
Here is a close up of the granulation in the forging.
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Those pictures show a lot... Looks similar to a MIG weld with no shielding gas... lots of impurities. I feel that the slight over-revving lean condition caused the casting errors (which look to be right at the base of the pin) to release the chunk of piston that is attached to the pin on that side. That allowed sideways pressure to be put on the rod, which broke with the upward inertia of the piston. Then you had the top of the rod and pin floating around in the case which caused the rest of the carnage.
My $0.02 ... Bailey's Customer Service is golden.