383 engine noise question

They have the engine apart and suppose to take photos for me. #2 cylinder has bad rod bearing plus two other rod bearings are showing wear. They think some of the bearing material from #2 got carried over to those other two rod bears causing the wear. They said there is also a scratch mark on two main bearings so machine crank and bearings. They disassemble the entire engine and it will get cleaned first. One thing that still sticks in my head is two years after the rebuild I dropped the pan to address a leak and noticed the oil shield for the front bearing had a hole worn in it. At the time I didn't know what that piece of sheet metal was so I sent a photo of it to the rebuilder. He told me what it was but he didn't seem real concerned about the metal that worn off and went into the oil pan. Other than the oil pump which only has a screen on the suction side I would think the filter should have kept anything bigger that 25 microns out of the rest of the engine. Unless less than 25 micron particles could have worn the bearings.

Update:
They didn't take photos but are suppose to save the bearings for me.