Scored Main Cap Bearing - Ouch

nm9stheham said
Not weird at all, #8 rod bearing is fed from the #5 main; #7 is fed from the #4 main.

Possibly some crud/crap/debris left in the oiling path to #5, which, has been pointed out, is a partially separate oiling path vs. the path to 1-4. Would the 'scrapings' off of the #5 main bearing from a sharp edge on the oil hole wipe out the #8 rod bearing? IDK
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I need to study the oil flow path once all the bearings are out to see if I can any sense of this. I think a poorly ground oil chamfer on the rear main started the problem along with the too long of bolts on the flywheel.