I slept on it and examined the flakes some more. There are some that are not magnetic and break like melted plastic / have a white-ish color to them.

there are some metallic flakes that appear to not be magnetic.

The other thing is, this car was in an accident and the A/C compressor was hit just enough to crack the block in the front near the chain. This was minor and the shop repaired it. But coudn't metal from the block have gotten in there while the engine was running after the accident and seized a bearing .. perhaps momentarily?

The oil cooler was destroyed as well - oil starvation?

What are the chances it was a fluke and the bearing is turning correctly now?

Will a stethoscope help me determine what is going in there accurately enough?

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It is hard to say without looking. A bearing shell has a steel back, a copper plated layer, and a layer of Babbitt material (tin/lead and ? alloy). The Babbitt part rides on the Crankshaft/Rod Journals and other parts. I don't know if the piston pins ride on Babbitt bearings in the Connecting Rod small end. When a bearing wears down to the steel backing (this is why I ask if the fragments were magnetic) it causes damage to part that rides on it. How much damage and were? You have to check; anything else is speculation and wishful thinking and goes back to what caused the problem to begin with.

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84 300D, 82 Volvo 244Gl Diesel

The cheapest way to fix this would be to run it until it dies, than roll the dice on a junk yard motor.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200