Do all the rods look like this ?
Do the mains look like this ?
How do the piston skirts look ?
How about can bearings and cam journals ?

In other words, what good and what’s bad in the engine.

If this wear is confined to the rods and mains the gallery’s were likely contaminated. Could have been media from block tumbling, honing oil that had metal in it that was not cleaned, etc.

We need more info.

The bearings look to be the narrow bearings, wide bearings would crowd the journal radius.