Found part of the problem (pic) :D

I'm, not posting this to start an argument, but, in order for metal shavings from the cam lobe to get to the bearings, they would first have to fall into the oil pan, be sucked into the pickup pass through the oil pump.......which is all very possible.

Then, they would make their way to the oil filter and have to go through that before going to the bearings. Getting TO the oil filter is very possible for metal shavings that have fallen into the pan. Getting PAST the filter is I suppose possible, but not very probable. At all.