Based on your description and reading between the lines, I would suggest a piston pin problem or a big end rod bearing problem.
Wrist pin could have been excessive piston pin clearance, wrist pin bushing shifted in the rod that shut off oil flow, plugged oil passage in the rod, rod bearing installed incorrectly that shut off oil flow to the pin etc.
Big end rod bearing could be bearing installation, big end rod diameter, loose rod bolts, failed rod bolts, crankshaft journal geometry etc.
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